I have fostered many little ones in my time and they were constantly fed like every hour. I know the sound kittens make and it is heart-wrenching. ou can't ignore the little squeaks and cries, oh dear. I was giulty of feeding mroe than I should, but the worst that happened was they just had to use the bathroom more!! Remember that a crying kitten/puppy is either cold or hungry. They dont cry when they want to play like many would think. I say fill 'em up!!