How to help big brother adjust.. think of buying a baby doll?

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Hi ladies. Those of you who have more than one child, what did you do to help them adjust to not being the only child anymore? I’ve wanted to buy my son a baby doll so he can learn how to be gentle and “practice” with it. That’s the only idea I have really! Does anyone have any other ideas, or would this be a good start? Thanks ladies!