Underweight Bombay kitten food advice

A Bombay kitten who's consistently underweight despite eating full portions is a real puzzle — and it's exactly the kind of thing worth taking seriously at four months, because this is such a critical window for muscle and bone development. Kittens have very different nutritional needs from adult cats: higher protein, more calories per kilogram of body weight, and specific nutrients like DHA, calcium, and taurine that drive healthy growth. If the portions look right on paper but the weight isn't following, the food itself — specifically its caloric density and digestibility — is usually the first place to look. So, tell me a bit more: how old is your kitten exactly, do you know the breed, and what are they currently eating?

That's really useful — and honestly, the Felix pouches are likely a big part of the problem. They're high in moisture content, which is great for hydration, but the caloric density is quite low. She could be eating what looks like a full portion and still not getting nearly enough calories to support her growth rate. At four months a Bombay kitten needs roughly 200–250 kcal per day depending on her current weight, and a standard Felix pouch delivers around 60–70 kcal. If she's having three or four a day, she's likely running a meaningful caloric deficit. Can I ask — is she on wet food only, or is there any dry food in the mix?

Wet food absolutely has benefits — hydration, palatability, protein quality — and for kittens it's a solid choice. The issue isn't wet versus dry, it's caloric density. Felix As Good As It Looks is designed for adult cats and is quite dilute in terms of energy. For a growing kitten who's already underweight, you need something formulated specifically for kittens with a much higher caloric payload per pouch. My recommendation is Royal Canin Kitten Instinctive wet pouches. Each pouch delivers significantly more usable energy than Felix, it's been formulated precisely for kittens up to 12 months, and the protein and fat ratios are optimised for the growth phase. It's also highly digestible, which matters a lot if there's any chance her gut isn't absorbing everything efficiently. I'd suggest moving to 4–5 of those pouches per day given her current deficit, and reweigh her in two weeks. The change in trajectory is usually visible quite quickly.

It's a fair concern, but the good news is that four months is still very early — kittens are remarkably resilient at this stage and the growth window doesn't close for several more months. If her vet has checked her over and found no underlying issue, the most likely explanation really is caloric insufficiency from a low-density food, and that's entirely correctable. Kittens who get adequate nutrition from mid-kittenhood onwards typically catch up well. What you want to avoid is letting the deficit continue into the five-to-seven month range when the most intense skeletal development is happening. Getting her onto Royal Canin Kitten Instinctive now, at the right portion size, puts you in a strong position. Do keep logging her weight weekly — a simple kitchen scale works perfectly — so you can track that she's moving in the right direction.

Great plan. Transition over about five days — mix in a little more of the new food each day so her gut adjusts smoothly. You should see her weight start trending upward within two to three weeks. If she's still not gaining after a month on the new food at the higher portion, it's worth going back to your vet to rule out parasites or a malabsorption issue — but my bet is the food change alone will do it. She's lucky to have someone paying this close attention.