The first sketch:
Everything is realtively proportionate you just need to work with the features a bit. Take a look at that Loomis section about eyes not being flat... then I think you will see what I mean. Also the teeth... I would usually avoid drawing in teeth, suggest them rather than render &, same with the hair (avoid drawing each hair).
Don't have too many crits with the baby head.
Watch out for those eyes... make sure they are not crossed
(again... look into the loomis section on eyes).
The last sketch:
Your sterno mastoids... look into that. They converge in the manubrium not mid clavicle. Same crits with the first drawing.
My last bit of advice would be to listen to Crimson Moonlight really loud