There are many brands of formula milk, but all depends on your child's taste profile. Choose a reputed company one. Unfortunately it may take a few trials if different brands to finalise on one that your son likes to drink. Alternatively you can use a breast pump and pump breast milk for him to have during the day. My own kid is ten months so i went through this recently. Please book an appointment to discuss further. You can follow me on Instagram @pediatrician_india for more helpful tips ! Take care !