My daughter was a year and a week old when we brought her brother home. At the hospital she loved him wanted to hold him etc. When we brought him home she cried. We put him in his cradle and she cried if he moved or sqirmed. She hated him. She literally cried for five hours that night. We put him to the side and just spent as much time with her. She lost her mommy and daddy for two days and then this thing entered her life. She wasn't happy!!
I like what another poster wrote about ignoring it. My kids fight like crazy. and it is mostly by my older child she's jelous. We try to give her as much if not more attention. It's hard becuause our boy is the easy going lovable type. She is difficult and doesn't want to always cuddle. It is like juggling I guess.
I do know that if your breastfeeding he'll try to act up. that is when you put the baby down let her cry and go tend to him, otherwise he'll learn you won't always come and he'll act up even more.
Just give him as much alone time, attention as possible. Make things special just for him.
it's hard. it doesn't get easier. others are right on.. they just keep fighting!!
I've been watching the nanny shows.. my kids are getting better becuase they know we don't allow the mean behavior toward eachother.otherwise they'll find them selves in the naughty corner. We also have a star/sticker piece of poster board on the wall with their names on it. and they get stickers ; stars when they make good choices. or listen are helpful etc.
Hope this wasn't just a rant and it helped.