300O: 1970s book about baby brother

I’m looking for a book I had in the 1970s. It was about a little girl who was, I think, called Amy.  She was upset her mother had a new baby brother until it ended up that she was the only one who could make him laugh.  The whole book was in orange and white. Pleas help me find it.  It could have been called something along the lines of

A Brother For Amy

Amy’s New Brother

Amy’s Baby Brother

 

Thank You,

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