“I’m good on those items but really appreciate the offer!”
With small stuff my fiance accepts it then it goes in the trash honestly
It's just not worth the fights with his family kinda thing for us though
I have told some people since it’s my first baby I’d prefer to buy her own items that aren’t hand-me-downs.
“Thank you for sending this my way and thinking of me! We already have a plan for those items so we will pass on these!”
I just say “sorry I don’t have the space” which is partially true anyway as our house is small so I don’t have room for stuff I won’t use.
I just politely say "no, thank you. I'm sure someone else could use it more than I could" and leave it at that