Clothes organization!

Chelsea • Happily married. Have 2 amazing sons and ttc baby #3.
Need some ideas and help on how to organize my little guys clothes. I have a 6 drawer tall but narrow dresser. His closet isn't much of a closet as it's just shelving. I may be able to put a small shower rod or something for certain things. 
How are you ladies organizing sizes? Onsies in one drawer but each pile a different size? I have no clue!! Help!