| | Family Health | Toddler Health What is the healthy amount of phosphorus a 14-year-old should take each day? According to the National Institutes of Health (NIH), the recommended daily intake of phosphorus for a 14-year-old is 1,250 milligrams. Toddler Health - Related Articles Fluorescent Lights & Toddler Eyesight Is the second-born child usually less intelligent than first-born? When should you bring child to doctor for fever? About Toddler Ear Pain Sensory Board Project for Kids Are Hot tubs bad for toddlers? How to mother a 14 year old boy?