Talk to Pediatrician on Underweight Baby

My 16 months is just 8kgs, I am extremely worried about his health, he jas six teeth(four upper and 2 below), we have not introduce him anything to chew yet like roti or any thing from our plate , as he vomits if something stucks in his throat. So, overall I want to mention that right now he takea everything in puree form just like cerelac. He does not take feeder, just BF and I try to give him formula milk ( Similac 3) with cup n spoon. Plzz guide a healthy meal plan n timing as well coz he wakes up at 10am n also sleeps late...I Am a frst time mother, n very much worried. JazakAllah in advance for answering.