Can you? Yes. Give him a t-bone steak if you want. Should you? NOOOO!!
Babies need only breast milk/formula for the first 6 months. SIX months. Then just tasts of this and that if baby seems interested in food, but the best first foods are things like soft ripe banana, mashed up, or crushed up pawpaw or avacado. Baby cereal is difficult to digest, it is iron fortified so that can cause constipation (and all the screaming and pain that goes along with abdominal discomfort). Don't start Baby on cereal until he or she is at least a year (or two) old.
Also all food should be given on a spoon so it can mix with saliva in the mouth before being swallowed. Only breastmilk/formula should be swallowed and doesn't need to be mixed with saliva before being swallowed. If baby just pushes food from a spoon straight out of his mouth with his tongue, he is too young for solid foods. Stick to b'milk.
at 11:57 PM on May. 19, 2011