My baby neck control is strong and stable but he is unable to sit. Can i still feed him solids? How do i let him 'sit up' ?

Strong neck control is more crucial than being able to sit. You can try feeding him solids but he will need some assistance to be in the upright position while seated. My friend who had the same issue fed her baby in the car seat and also tried having her boy in her lap. A high chair could also work with added padding to help "secure" the baby in the upright position. Hope one of these suggestions work for your baby!