5 month old might be too young to enjoy all the food/play of those Child-Friendly Restaurant. Most of the time they will be in the stroller/sleeping. Perhaps, you wana consider less noisy restaurant where they can sleep peacefully. Here's a list of Child-friendly restaurant for your future reference http://www.cheekiemonkie.net/2015/02/12-great-child-friendly-restaurants-in.html
Read more
mummy of an "overnight celebrity" girl