Could four months have gone by already?

Isabella is growing so fast, I can barely keep up! She's 26 1/4th inches long & weighs 15.4 pounds! The doctors said she's the size of a 6 month old and extremely tall. She's still putting her fingers, any anything she can get her hands on, in her mouth all the time. She sleeps 12 hours at night (which we love!) She started eating baby oatmeal and babyfood about 2 weeks ago and it's so fun to watch her explore all the new tastes. I go back to school next week and I'm really, really sad about leaving her. She hasn't rolled over yet, but she can roll from her back to her side so we know it's probably coming soon. She's started to lose some hair on the back and the sides from rubbing her head when she's laying down, but the doctors said it will grow back once she starts sitting up. She still hates tummy time, but we still make her do it several times a day. She actually laughs out loud so much now. It's the absolute cutest thing I have ever heard. Sometimes when I laugh REALLY hard it makes her laugh out loud too and it just melts my heart. Of course, no one can make her laugh as much as her daddy. She adores him so much. She's wearing 3-6 month clothes but I'm pretty sure she'll be in 6-9 month clothes very soon. Her eyes are still green, so we're curious to see whether or not they will stay that way. I'm so in love with her, she's probably the most well-behaved baby I've ever seen. (and I'm totally not biased!)