Hello ? We're at week 2 and weigh 5100, in one month we were 4450, born…

Hello ? We're at week 2 and weigh 5100, in one month we were 4450, born 3500 My doctor said I gained little for two months And prescribed me tablets Apilak, and lacto-miL mixture. She said this to make the milk fattier, has anyone tried it? What results did you get? Please share your experience, is it worth it or something else better? In general, there isn't much or little milk, maybe it's not really fatty, just ??‍♀️ baby eats every hour and a half