Hi T., First of all congradulations on your new baby boy, how exciting I know this is for you. I would say Olivia senses something, if you have not talked to her about her new baby brother, as an old school mom, I really have never believed in the terrible two syndrom. If you have not talked to her, do it, I'm not sure how much she will understand, but she will feel apart of this blessing, when the baby is active let her lay her head on your stomach and feel the baby moving around, I'm sure by now you hav his nursery or sleep area already fixed up, let her help you choose like what blanket to put in the crib, or what stuffed to put in the crib, let her be a part of your decisions, it makes such a big difference in a child adjusting to a new sibbling, after the baby is born let her help you pick out his outfit, let her help you when you give him a bath, it will be a lot of work, she's going to be so busy being mommy's helper that she isn't going to have time for her litttle tatrums. I don't believe children should be allowed to throw tatrums, but in her case right now don't get sngry with her, don't give in to her either but try and find a common ground with her, and I do believe if her change in behavior is due to the up coming blessing, envolving her will create some possitive changes, and remember to reward those changes, and praise her for good behvaior. When I was pregnant with my second child, I had a toddler, I envolved him in everything, I even took him to my doctor appointments so he could hear the baby's heart beat, when my second so son was born, my first born was 3 and 4 months old and he wanted to do everthing for his little brother, there was bo jealousey at all, but when I became pregnant with my 3 child, my first born was 5 and my second born was 2 and 3 months, I let both my sons help pick out wall paper, stuffed animals, and then when I was 5 months pregnant we found out the baby was a girl, so when my husband and i shared that with our boys, it did not go over to well, our 5 year old kept telling our 2 year, mommy is going to love the girl more than us, and when you are 2 you believe everything your big brother tells you, daily I did my best to reasure my boys that my love for them would not change when their sister came, I was amazed because I was putting the crib up in mine and my husbands room, which was the smller room in our apt at the time, we have givien the boys the mater bedroom with the bathroom and shower, we felt they needed more room than we did any way, my boys came in and my 5 year old ask me why i was putting the crib in our room instead of their room, I told him because she was going to wake up crying at night and I didn't want her to wake them up, he was like that's OK mommy,we want our sister in our room, so we put the crib in their room, when she was 2 weeks old we moved into Navy housing, and of course we fixed up a room for her, and I let the boys pick out decor for her room, I let them pick out her daily outfits, I just envolved them in as much as I could, and now they are 25, almost 22, and 19 and my boys are the best of friends, and my daughter and her brothers are so very close. Sorry I went on and on, I thought you might enjoy that story. Good luck and happy blessings, to your family. J. L.