Generally nice photos for being someone who is just starting out...general comment...I agree with the others that the lighting is flat - the baby does not stand out from the background very well...
#1. fairly good image, but read up on the "rule of thirds" - take him out of the centre of the image - he is looking left (as I look at the image), so I would place him a bit more to the right in the image, so that it looks like he is "looking" at something on the left side of the image. Don't know if you can arrange that by cropping the original or not - next time.
#2. Centre shot - again "rule of thirds" for starters. There is no expression, at least for me, on his face - unlike #1 - 'nuff said.
#3. Agree with 480SParky - I would take out the "surf board", maybe leave the beach ball, but reposition - not sure where...also, you cropped the beachball which is not something you really want to do - makes picture look incomplete, among other things.
HTH...
Cheers,
WesternGuy