Sex After Giving Birth

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My friend is asking me about things I don't have vast knowledge about. He is worried that, will the sexual inter course with his girlfriend ever be the same after she delivered a baby through a vagina. He is worried that it won't shrink back to its normal. From what I know and understand, I explained my 2cents, that it definitely will shrink back, and some even apply some creams to ensure its shrinkage. Can someone with sufficient knowledge please explain.