moms!! how do you entertain your baby? mine is 4 months old and lately she's just soo bored. she's…

moms!! how do you entertain your baby? mine is 4 months old and lately she's just soo bored. she's at that age where she can't crawl and necessarily play with toys on her own and can't sit up. i constantly move her from swing to bumbo to play mat all day and she still gets bored with all of those by 2 pm then she just whines cus she has nothing to do... adivice?