Most infants are physically ready to start eating solid foods when they a. can sit up with some back support. b. develop the swallowing reflux. c. lose the let-down reflex. d. have most of their primary teeth.

The correct answer is A.
The official guidelines from doctors state that infants should start consuming solid food after the age of six months. In order for the infants to be safe and healthy, they need to be able to sit up, support their back and chew safely before being given solid food. 

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