Short answer
Yes, a tiny taste of plain banana or unsweetened banana baby food is safe for a kitten, but it's not necessary. Their main diet should be a high-quality kitten food formulated for their growth needs. The sugar in banana can cause digestive upset or contribute to weight gain if given too often. Offer only a pea-sized amount as an occasional treat and watch for any soft stool or stomach discomfort. If your kitten shows any adverse reaction, discontinue and stick to their regular kitten food.
Banana — Food safety facts
Safe to share · Cats · full breakdown on the linked food page
Safe in moderation. High in sugar — small slices only, especially for small dogs.
The full verdict, portion guidance and serving notes are collected on the Banana food facts page.