My DS is 4 weeks, was diagnosed with reflux at birth, but is doing well exclusively bf'ing (no supplements as of yet). At his 2 week well visit the Ped gave us a perscription for a vitamin D supplement. He said many women have a deficiency so instead of testing everyone they just give the supplement. My DD who is now 2 was also BF and I never heard of such a thing with her. Has anyone heard of this? Is it really necessary?