Baby Animal Costumes Unisex Toddler Onesie Pajamas Halloween Dress Up Romper

My child is almost 2, thin and almost 34” tall. Which size would fit?

Is it possible to exchange for another animal? I recently purchased and received the cow costume?

My daughter is 1 and weighs 16lbs and is 28in i have no clue what size to get her?

My grandson is tiny. He just turned 3 and weighs 30 pounds what size?