There's two parts to your question: when to start solids, and what to give. For When: Most pediatricians recommend starting solids at 4 months (which translates to 16 weeks, give or take a few days - it gets a little dicey, as I'm sure you've realized). I wouldn't start solids until you have a good reason to do so. The main reason parents add cereals to their baby's bottle is because it can help them sleep through the night, or to combat acid reflux. If your daughter doesn't have any trouble with either of these issues, and she's already gaining weight at a normal pace according to her pediatrician, I would not start adding things to her bottle. For What: What you use as a first solid food, beyond breastmilk or formula, is really more of a cultural thing. Some people like to start off with rice cereal, because it's got a low risk of intolerance or allergy. Some start off with banana. I've heard of a few who prefer to start with veggies (the theory being that if you start with fruit, the child develops a taste for sweet and will refuse most veggies). With some exceptions, there's really no right or wrong item to start with. Some popular choices, beyond rice cereal, oatmeal, or bananas include mangoes, avocadoes, apples, peas. If you are still uncertain if you should be adding anything to her formula, call your pediatrician. But unless you're worried about weight, acid reflux, or sleeping through the night, it should not be necessary to add anything at all.