Over-the-counter multivitamins are available in drop form for infants. Beginning in the first two months of life, a minimum of 200 IU of vitamin D per day promotes optimal baby development, Greer tells WebMD. This should continue throughout childhood and adolescence.
A kidney stone, also known as a renal calculus or nephrolith, is a solid piece of material which is formed in the kidneys from minerals in urine.Kidney stones typically leave the body in the urine stream, and a small stone may pass without causing symptoms.rinary stones are typically classified by their location in the kidney (nephrolithiasis), ureter (ureterolithiasis), or bladder (cystolithiasis), or by their chemical composition (calcium-containing, struvite, uric acid, or other compounds).
1 Cholesterol stones. These are usually yellow-green in color. They're the most common kind, accounting for 80% of gallstones.  Pigment stones. These stones are smaller and darker. They're made up of bilirubin, which comes from bile, a fluid your liver makes and your gallbladder stores.