Activities for a four month old?

Question

just some cute fun ideas to make playtime more exciting for my boy!

Answer 1

how about getting them those big colorful shape sorters, just remember that babies tend to put everything in their mouth.

Answer 2

things that make noise, babies love, and can be entertained with just about anything that will make a rattle or a jingle

Answer 3

I lay on the floor on my back and bring my knees to my chest and place my baby on my legs to make him be an "airplane"  making sure I hold onto him so he doesn't fall.  He loves it!

He also likes doing "itsy bitsy spider" on his tummy or rubbing something soft on his cheek.