Answer: Hi Dear!
Its important to start solid at a correct age, when the baby is 7 month old you start semi solids, Start off with porridges .keeping it as 1 meal a day and can introduce one meal each a month, qty is as he wishes and as much as he willingly takes..
You can start with steamed veggies, fruits, rice, dal, idly, dosa, kichdi, curd. Ripe fruits just hand mash, You can slightly overcooked/hand mashed if required. Normal family cooking oil, ghee or unsalted butter can be used.
Finger foods can also be given.
Please do not offer same food everyday. Offer a lot of variety. Do not add salt,sugar, jaggery, honey, palm sugar..
Hope this helps!