Hi My Wife Is Pregnant.she Had Last Period At 16th

Hi

My wife is pregnant.she had last period at 16th april.

We consulted the doctor told that baby growth is not good..

Let me know first my wife is taking Nutrilite protien powder 2 times each scoope contains. 8 grams protein.

Nutrilite iron -2 tabs
Each tab contains 15 mg iron and 100mcg folic acid

Nutilite calmag d -2 tabs
Each tab contains 200 mg calcium
135 mg magnesium
2.50mcg vitamin D

Doctor prescribed us
Susten SR200
COR-3

What will we do next?
Should we take this tabs? Which doctor prescribed?

And if there other way to growth of baby then pls help