What am i I wear a green jacket on the outside white jacket as a second layer and a red jacket on the inside pregnant with a lot of babies?

You are likely describing a watermelon! The green jacket represents the outer rind, the white layer is the inner part of the fruit, and the red flesh filled with seeds symbolizes the juicy interior where the seeds (or "babies") are found. Watermelons are known for their vibrant colors and refreshing taste.