What is the difference between an embryo

Toddler - A child 12 to 36 months old

Embryo - An embryo is an early stage of development of a organism

Foetus - An unborn human more than eight weeks after conception

Neonate - A newborn Child or an infant less than four weeks old

Infants - The term "infant" is typically applied to young children under one year of age

Explanation:

An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.