Question: what can you do with a three month old baby?
Answer: Foot Rattles With Towel Roll Under Bottom. By rolling a towel to lift the hips a bit, you may be able to help your little one see his feet with colorful socks or foot rattles on them. ... 
Singing, Talking, and Kissing Baby. ... 
Strategic Toy Placement On Baby's Activity Gym. ... 
A Toy On Baby's Chest. ... 
Balloons.