Meal related query! Her milestones?

Dear Sir/ Mam, Greetings! Please note that my daughter is 9months old! I have few questions related to her meal plans : 1) how many meals should be given to her at this stage? And what all should be given ? 2) minimum how many ounces of milk should she consume at this age? 3) is vomiting once in 2-3 days is normal? 4) what should be given to her to loosen her stools as she is suffering from constipation 5) he paediatrician has prescribed ' Tonoferon' syrup as iron supplement to her. Whenever she takes it , she becomes highly constipated. What shud we do?? 6) her weight is also not increasing since past one month . She currently weighs around 8 kgs 7) she was born during 34th week of pregnancy. Does this affect her milestones?? Looking forward to your reply. Regards Rishika ( a first time Mom)