The 'dosage' is hit or a miss with the drops anyway. It's just extra assurance that they are getting enough vit d
A little more from the formula won't hurt.
In the meantime the new mom could consult a LC to get her milk up.
I used fenugreek seed pills (2 pills after every meal 3) also oatmeal for breakfast and cookies as snack. I tried the tea but I couldn't drink it 3-4 x's a day.
Avoid caffiene and alcohols
The dr could also prescribe something to increase production too.