Question: fun things to do with a baby on a rainy day?
Answer: Bring out door inside. Bring toys you usually have in the garden inside. ... 
Indoor construction site. Allow your little ones to use pillows and blankets from around the house to build a den/fort. ... 
Make a head box. ... 
Make a sand free sand box. ... 
Shaving foam. ... 
Pasta / corn flour. ... 
Toy Bath Time. ... 
Puzzles, games and cards.