too soon to eat right?

baby just turn 4 months old i am getting tired of friends and family asking to feed the baby cerelac or blended porridge to her. i have a son 7 yrs old and started feeding only at 6 months, he is formula fed. now again, people are saying they can eat already they should eat, they wont be full from milk. i am fully breastfeeding my child and she looks full to me 🙄 and i for sure know my baby is not ready for food cause i put a empty spoon at her mouth and she's like whattttttt.. + she cant even sit yet. i saw only if they can sit with minimal support then can feed food right?