Welcome to HCM.
Usually mother's milk is sufficient for the baby and is the Best Food for the baby. Most likely your anxiety
is leading you to think that breast milk is not sufficient for him. If he is thriving well and is play full, you do not have to worry.
If you still think he needs additional food supplement you can give him Lactogen Formula 1 or Farex. Please don't force feed him. The child knows best when he needs food.
Wishing you a very healthy son.