Vitamin A comes from animal sources such as eggs and meat. Vitamin A, in the form of retinyl palmitate, is found in beef, calf, chicken liver; eggs, and fish liver oils as well as dairy products including whole milk, whole milk yogurt, whole milk cottage cheese, butter, and cheese.
Pepito is a boy's name. This is true, but it comes from Pepe.. When wanting to be cute with someone's name in Spanish certain names can add ito to them to make them silly. Pepe becomes Pepito, Pedro becomes Pedrito, etc. Similar to in English.
It can be a children's song, but in some versions of the song, the lyrics have been made from childish into vulgar, like a drinking song. Some Spanish versions include En la granja de Pepito (meaning On the farm of Pepito), El Viejo MacDonald tenia una granja (meaning Old MacDonald had a farm), El granjero tenÃ­a un campo (meaning The farmer had a field), or En la vieja factorÃ­a (meaning In the old factory).