My baby boy is 9 months old. We have started semi-solid foods for him since last 2 months. But from last 4-5 days he is not ready to eat anything except breast milk. Also when we lie him down on his back he starts crying. First we thought that he must have got hurt on his back but he sleeps well on his back without crying. He starts crying only when we lie him on his back to give him food. What could be the reason and remedies for this. Kindly guide us