I'm sorry to hear about your struggle. Is her milk not produced in enough quantity? Is she having any breast diseases?
You want to seek a doctor for your wife or your child's milk? If the doctor is for your wife's low milk output kindly consult a breast surgeon. They are surgeons but they handle medical issues as well related to breast. For your child, you could try lactogen 1 or see a pediatrician.
For further consultation, you can choose from our list of best Gynecologists in Karachi and seek in-person advice.