Me and DP are young parents and have a 6 month old DD. We would love our children close in age so will most likely have another soon 
SIL age 16 is pregnant and MIL has said SIL would like to have our next2me crib, prep machine, steriliser, clothes if it's a girl, car seat... etc. I laughed it off saying no I'm keeping everything for future DC. She said she wasn't joking and that we are family we should share. But I bought the crib, prep machine, and car seat out of my own pocket (expensive!!) and I've given away all DDs clothes so far except special items which SIL has apparently said its only fair her baby has them if its a girl. DP told Mil no to as SIL has a history of stealing from family and most likely we wouldnt get anything back.
I dont mind saving some clothes from now on but expecting to borrow/be given nearly all our baby things is rude? SIL herself text me too saying she will save up some money and buy everything off me and I feel bad saying no but I'm 21, I want more kids!