Older Children Acting Out

Amanda • I'm 26 and this will be my 3rd child. I have 2 boys who are 10 months apart.
I have a 5 and a 6 year year old. They say they are Super excited for the baby. They want to hug my tummy at bed time and ask to see pictures of what the baby looks like every day, but they have also been taking longer to do things, not listening, and just all around acting out. Does anyone else have this problem and how are you handling it? Any advice is appreciated.