Yess dear ,earlier also I've replied for your query smaller breast size is not responsible for milk production, its may be genetic or you are protein deficient or some other reason to be find out.
Please tell me in personal query on this app about your pre pregnancy and post pregnancy health status and number of children you're having.
Next Steps
You can take online appointment or call through this app to clarify all your query and regain normal health
Health Tips
Eat high protein diet