When did you introduce solids?

Melissa💙
My son is a big 3 month old. I'm wondering when everyone started solids with their little ones. I'm going to check with his doctor on the 22nd when he sees her at his 4 month check up to see if I can introduce some rice or oatmeal cereal. I think it will Help him sleep through the night if he has it for dinner. I remember starting my daughter right around 4 months...