Should I introduce onions to my baby? When can I introduce onions? These are questions that many parents are concerned about. Onions can be introduced as soon as the baby is ready to start eating solid foods, usually around 6 months of age. Parents may consider introducing onions to their babies by making steamed onions with rock sugar. However, they may also be concerned about the safety of onions for babies. This post discusses when to introduce onions to babies, how to do it safely, its benefits, and onion recipes for babies.