Cute kid! Agree with Banana, I like #3 the best. The concept in #1 is good.
I'm not a baby photography, so here are some general, abbreviated comments from a hobbyist:
#1 - More DOF. Vignette is a bit much in the first.
#2 - Weird processing.. background is bright, guy is dark, baby is blown out. Colors seem off.
#3 - Cute. There also seems to be a greenish tint (top of baby's head, on baby's right cheek to forehead, and on right elbow)--WB issue? Something to do during shoot, fix headband bow.
#4 - Cute shot, but too much negative space at right. Clothing and bow clipped at top center/left-center. Seems out of focus?