Baby’s Bottom Nibs Explained: Why New Pens Won’t Write

You unbox a brand-new fountain pen. The nib looks perfect. The finish is flawless. You fill it with your favourite ink, touch it to the page and… Nothing. You try again. Still nothing. You rotate the pen slightly. You scribble a few loops. You press a little harder. A tiny line appears, disappears, and then returns when it feels like cooperating. The first thought is usually: “Is the ink bad?” The second is: “Did I get a defective pen?” And sometimes, the real culprit is something much smaller and much harder to see: a nib condition commonly called baby’s bottom. It sounds amusing. It isn't particularly amusing when your expensive new fountain pen refuses to start. The good news? Baby’s bottom is understandable, diagnosable and, in many cases, fixable. What Exactly Is a Baby’s Bottom Nib? A fountain pen nib should have two tines that meet at the writing tip. When viewed from the side, the tipping material is carefully shaped so that the ink can reach the paper while the nib glides smoothly across the surface. With a baby’s bottom nib, the tipping material has been polished too far around the underside of the nib. Instead of the two tines presenting a suitable writing point to the paper, the tipping can develop a rounded, concave shape. The result? When you write normally, the paper may actually be touching a part of the nib that sits slightly above the ink path. Ink is there. The feed is working. The converter may be full. But the paper isn't making the right contact with the ink-bearing part of the nib. That's why baby’s bottom can produce one of the most frustrating fountain pen symptoms: The pen writes when you press or rotate it, but skips or hard-starts during normal writing. Why Does a Brand-New Fountain Pen Have This Problem? This is where things get interesting. Baby’s bottom is generally associated with excessive or incorrect polishing of the nib tipping, rather than normal use. Nib finishing is a delicate process. A nib needs to be smooth, but there is a point where "smoother" stops being better. Imagine polishing the bottom of a shoe until the sole becomes rounded instead of flat. It might feel incredibly smooth in your hand. But when you put it on the ground, it doesn't make the contact you expect. A nib can behave similarly. The intention behind excessive polishing is usually understandable: manufacturers and nib technicians want the nib to feel exceptionally smooth. But if too much material is removed from the underside, the result can be a nib that feels wonderfully smooth when it writes while being frustratingly unreliable when starting a stroke. And that distinction is crucial. Baby’s Bottom vs. A Dry Nib: They Are Not the Same Problem This is where many fountain pen users waste time. Your pen is skipping. You assume it isn't getting enough ink. So you flush it. You change the ink. You try a wetter ink. You switch cartridges. And nothing really fixes the problem. That's because baby's bottom is primarily a nib-contact problem, not necessarily an ink-flow problem. A dry nib generally has insufficient ink reaching the writing point. A baby's bottom nib may have plenty of ink available — but the nib isn't contacting the paper correctly. A simple clue If the pen writes when you apply slightly more pressure, but fails to start reliably with a very light touch, baby's bottom becomes a possibility worth investigating. Do not immediately press harder, though. Fountain pens generally should not require pressure to write. The Classic Symptoms of Baby’s Bottom Your fountain pen may have baby's bottom if you notice several of these symptoms: 1. Hard starting after pauses You finish a word, pause for a few seconds and then the next stroke refuses to start. 2. Skipping during normal writing The pen writes beautifully for part of a word and then suddenly leaves a blank section. 3. It writes when you press harder This is one of the biggest clues. 4. It writes when you change the writing angle A tiny change in angle can alter which part of the tipping touches the paper. 5. It writes upside down or at unusual angles That can be another clue that the nib's normal contact point isn't behaving correctly. 6. The nib feels extremely smooth This sounds like a good thing. Sometimes it is. But an unusually glassy nib combined with severe hard-starting deserves investigation. Before Blaming the Nib, Check These Five Things Don't diagnose baby's bottom too quickly. There are several much more common reasons why a new fountain pen might refuse to write. 1. Is the feed properly saturated? If the ink hasn't reached the feed, the nib obviously won't write properly. Give the pen a little time after filling. 2. Is the converter installed correctly? A poorly seated converter can interrupt ink flow. 3. Is the nib positioned correctly? If the pen is held at an unusually steep or shallow angle, you may not be presenting the nib correctly to the paper. 4. Is the ink unusually dry? Different fountain pen inks have dramatically different flow characteristics. A very dry ink inside a dry-writing pen can produce frustrating results. 5. Is the paper responsible? Some papers absorb ink aggressively, while others are extremely smooth and fountain-pen-friendly. If you're serious about fountain pens, choosing suitable fountain pen friendly notebooks can make a surprisingly large difference. Here's the Fascinating Part: Baby’s Bottom Can Hide in Plain Sight A nib can look absolutely perfect. That's what makes this problem so frustrating. You may inspect the nib under normal room lighting and see nothing unusual. The tipping can be beautifully polished. The tines can look aligned. The nib can feel silky. And yet, the pen still refuses to start. This is why proper nib inspection often requires magnification. A loupe allows you to inspect the relationship between the tines and tipping far more accurately. If you're building a serious fountain pen collection, a fountain pen loupe and nib accessories can be surprisingly useful for understanding what's happening at the writing tip. Can You Fix a Baby’s Bottom Nib Yourself? Technically, yes. Should you immediately attack your expensive fountain pen with abrasive paper? Absolutely not. This is where enthusiasm can become expensive. Nib tipping material is tiny. A few incorrect strokes with an abrasive surface can permanently change the writing characteristics of the nib. You can create: Misaligned tines Scratchiness Excessive baby's bottom Uneven tipping Poor ink flow An unnecessarily broad writing line And once you've removed material, you can't simply put it back. For an inexpensive nib you are comfortable experimenting with, nib tuning can become an interesting skill. For a valuable or newly purchased fountain pen, professional adjustment is generally the smarter route. What Does a Professional Nibmeister Actually Do? A good nib technician doesn't simply "make the nib smoother." They diagnose the problem first. The nib may need: Tine alignment Flow adjustment Tipping reshaping Polishing Correction of the writing angle Adjustment of tine spacing In the case of baby's bottom, the goal is usually to restore the correct relationship between the tipping and the paper without sacrificing the smoothness that makes the nib enjoyable to use. That's an important distinction. The objective isn't: “Make it as smooth as physically possible.” The objective is: “Make it smooth, reliable and correctly tuned.” Can Ink Make Baby’s Bottom Worse? Ink doesn't create the physical shape of a baby's bottom nib. But the wrong ink can make the symptoms much more obvious. A particularly dry ink may already produce marginal flow. Combine that with a nib that has poor paper contact, and suddenly the pen becomes extremely difficult to start. Conversely, a wetter ink may temporarily make the pen appear better. That's useful information — but it doesn't necessarily mean the underlying nib issue has disappeared. If you're experimenting with flow, exploring different fountain pen inks and cartridges can teach you a lot about how nib, feed, ink and paper interact. What About Fountain Pen Friendly Paper? Here's another piece of the puzzle that doesn't get enough attention. The same nib can behave differently on different papers. A rough paper can make a baby's-bottom-like problem seem worse because you're constantly changing the pressure and angle of the nib. A smooth paper gives you a more consistent writing surface. For testing a troublesome nib, try a quality fountain pen friendly notebook rather than immediately blaming the pen. Good paper should allow you to see the actual behaviour of the ink and nib without introducing unnecessary variables such as feathering, excessive absorption or rough fibres. Can You Prevent Baby’s Bottom? If you're buying a new fountain pen, one of the best things you can do is test the pen properly rather than assuming every nib will behave identically. At Makoba, we have a wide range of fountain pens across different brands, nib sizes and price points. When choosing a pen, think about how you actually write. Do you use a very light touch? Do you prefer Fine or Extra Fine nibs? Do you like wet Broad nibs? Do you write at a steep angle? Do you prefer highly lubricated inks? These details matter. If you are particularly sensitive to nib performance, exploring our fountain pen collection and choosing a nib size that suits your handwriting is a much better starting point than simply choosing a pen because it looks beautiful. One More Thing: Don't Confuse Baby’s Bottom With Normal Fountain Pen Behaviour Not every hard-starting pen has baby's bottom. Sometimes the converter simply needs priming. Sometimes the feed is dry. Sometimes the nib needs alignment. Sometimes the ink is the problem. Sometimes the paper is terrible. And sometimes you're simply holding the fountain pen at an angle it doesn't like. That's why diagnosis matters. A fountain pen is a tiny writing system made up of several interacting components: Nib → Feed → Ink → Paper → Writing Angle → Pressure Change one, and the entire experience can change. The 30-Second Baby’s Bottom Test If your new fountain pen is refusing to start, try this: Step 1: Make sure the feed is properly saturated. Step 2: Write normally using very light pressure. Step 3: Try the same stroke with slightly more pressure. Step 4: Try changing the writing angle very slightly. Step 5: Test on smooth, fountain-pen-friendly paper. Step 6: If the pen consistently starts only when pressure or angle changes, inspect the nib under magnification or have it professionally checked. Don't immediately reach for an abrasive. The nib may simply need a proper diagnosis. A Smooth Nib Isn't Necessarily a Good Nib This may be the most important lesson of all. When people buy a fountain pen, they often say: “I want the smoothest nib possible.” We understand why. Smooth feels luxurious. But fountain pen nibs need something more important than absolute smoothness: Reliable contact with the paper. A beautifully tuned nib should start immediately, maintain consistent ink flow, glide naturally and feel comfortable without requiring pressure. That's what you should really be looking for. Not the smoothest nib. The best-balanced nib. Final Verdict: Baby’s Bottom Is Small — But Its Impact Isn't Baby's bottom is one of those fountain pen problems you may never notice until it happens to you. The pen looks perfect. The ink is flowing. The nib feels smooth. And yet your first stroke mysteriously disappears. Once you understand what's happening, the mystery becomes much easier to solve. Before blaming your ink or replacing your pen, check the basics. Give the feed time to saturate. Try another paper. Check your writing angle. Examine the nib under magnification. And if the symptoms strongly point towards baby's bottom, resist the temptation to start grinding away at the nib yourself — particularly if you've invested in a premium fountain pen. A fountain pen should make writing feel effortless. When everything is properly balanced, the nib should simply touch the page and the ink should appear. No pressing. No coaxing. No mysterious blank starts. Just ink, paper and that wonderfully satisfying first stroke.