15-16 hours total. May start showing slight day/night awareness.Source: National Sleep Foundation sleep duration recommendations (Hirshkowitz et al., 2015), endorsed by AAP/AASM
Vitamin D drops as advised by your pediatrician are the recommended way to prevent deficiency; a little gentle morning sunlight can be a pleasant routine but is not a substitute, and is not a treatment for jaundiceSource: AAP — Prevention of Rickets and Vitamin D Deficiency (Pediatrics 2008)
Gripe water is not recommended by pediatric bodies — evidence it helps colic is lacking and some products have been recalled for contamination; talk to your doctor before using any colic remedySource: Cleveland Clinic / NHS on gripe water