Our third little boy was born 3 weeks ago. Our oldest, who is 6, hasn't had too much trouble with having a new baby at all and loves it. Ds2, who will be three in a few months, is having more trouble. Once baby was born, he became defiant and moody. He and his brother used to play so nicely together and now all they do is fight. There are quite a few tantrums and refusal to play. He is pretty gentle with the baby, but has said negative things about not liking him or wanting to get rid of him. Some days have been okay, but we've been having more and more bad ones.
I know it's probably normal, but I'm curious how long it usually takes for siblings to get used to this and get back to "normal".