Vitamin D drops

Hailey • I'm 25 years old and live in Northern California, I also have a 2 year old little girl 💖
What are breastfeeding mommas giving their babies as far as vitamin D supplements? I picked up some upsbring brand wellbabyD drops today it says 400 IU vitamin D3. I haven't given them to her yet because I don't know if they are the right kind.
UPDATE: 
These are what I bought. Love them! Only 2 ingredients (: