“…Therefore, the AAP (Wagner, 2008) and the National Academy of Medicine (formerly, Institute of Medicine, 2011) recommend that all breastfed infants and formula-fed infants receiving less than 1 liter of formula per day receive supplementation with 400 IU of vitamin D daily (Institute of Medicine, 2011; Wagner et al, 2008). However, compliance with this recommendation is quite poor in the United States, with studies showing < 2% of all infants receiving vitamin D supplementation (Lehtonen et al, 2014). Recent studies have found that maternal supplementation (4,000-6,400 IU daily or 150,000 IU monthly) is a safe and effective way of achieving vitamin D sufficiency for exclusively breastfeeding infants (Hollis et al, 2015; Oberhelman et al, 2013; Thiele, Senti, & Anderson, 2013).…”