I know of some mothers that started their babies on them while teething waiting for their first tooth to come in. Not positive though, I'm sure it is fine they devolve very well. My baby has both her teeth in already.
I got them at Target in the baby food isle.
They are by Plum Organics their called Little Yums
She's eating the pumpkin & banana kind but we also got spinach, apple & kale
I'll post a pic so you guys can see.
I believe 3.99