Methods for delivering at least one compound selected from nicotinamide riboside (NR), nicotinic acid riboside (NAR), and nicotinamide mononucleotide (NMN), derivatives thereof, or salts thereof, in combination with at least one of thiamine (vitamin Bl), riboflavin (vitamin B2), niacin (vitamin B3), and pyridoxine (vitamin B6), to an infant human subject in need of said compound or compounds are provided.