My 13 months stopped drinking FM

Hi, my son has recently started refusing to drink FM. He will shake his head and if insist on having him to drink, he will start screaming. He only drinks either during the night when he’s trying to fall asleep or early in the morning (both very sleepy situation). Currently eating solids for his meal such as porridge, noodles, etc. also giving him snacks as well. Is this a sign of concern? #pleasehelp