K.S.
My oldest is a boy, 2 1/2 years old now. (17 month old girl) He was and is still more whiney than my daughter is, EVER! When he was first born up until now his terrible two's! It's worse when he's sick and not feeling well, tired, hungry, you name it! He's not so bad on a normal basis, but I do believe it's something he'll grow out of. He's definitely much better than he was, but it's still there. I definitely don't think it's anything you have to worry about. He IS just a baby. Everyone is different. It'll get better. My son doesn't always feel better with more comforting, sometimes he just wants to cry.. so I let him. I give him a few minutes and I pick him up and all is okay again.
Good luck!
K.
PS. Congrats with the IVF! My girlfriend just went thru round 2 or 3 and she was pregnant this last time for maybe 2 months with one baby. She lost the other two right away, but then she lost the third.