I'm currently hand rearing 2 baby cockatiels from a clutch of 3. The biggest baby was left in my avery to be raised by the parents and is now happily fledged. I originally selected the smallest of the 3 to hand rear, but after a few health scares... shivering, weak neck... I decided to bring in the middle sized baby to hand rear alongside the little one, which perked him up immediately. They are 3-4 weeks old now. Baby 2 is growing wonderfully and is now at weaning stage, however, the smallest is still very small. His flight feathers are through, but the rest of the feathers are taking quite a while to develop fully. He is still very small in size, but his strength and reflexes are developing well and he has a very perky, affectionate personality. This is my first time hand rearing on my own, my parents are bird breeders, but havent come across this slow growth before. I've read about 'stunting' online, but I was wondering about the implications for my little bird in the long term. Other than this slow growth, he seems very healthy, but I'm still concerned, so any advice or information would be much appreciated!