Vitamin D

Brandi • First time Mommy 💖
What are opinions on vitamin D, gripe water, and nasal saline? My little one is 2 weeks and 4 days old is still a little jaundice yellow in her eyes (reason for vitamin D)... She also has the hiccups all the time, also very gassy (reason for Gripe water) 
She is breast fed and I really want her to get all she needs... And what works best for you mommys to give supplements? After a feeding? Vitamin D and gripe water at the same time?  Any help greatly appreciated