My mum and I keep arguing about this and it's driving me nuts. My (step)son came into the world in difficult circumstances (thrusted on my fiancé and me at short notice by his birth mum following being in and out of foster care) and my mum's friend went out on a limb to pass on her sons' outgrown clothes, toys and equipment within a day, which was gratefully received. Similarly my sister-in-law gave us a lot of outgrown clothes which we were very thankful for.
I've since offered expectant friends (or their mums) outgrown stuff - paying forward if you like - and my mum says I'm putting people's backs up by offering stuff. In reality lots of people are/have been struggling for money due to Covid-19 (furlough etc) and you would think people would appreciate the gesture. The saying 'Charity begins at home' springs to mind. But however if it's my fiancé or my mum offering it's somewhat acceptable! (Lots of outgrown stuff has subsequently been passed on to my fiancé's now ex friend and my mum's friend's expectant daughter without an eyelid batted 🙄)
Similarly when my now ex bestie gave birth to her eldest I asked my college friend (a mutual friend) if she could have his baby sister's outgrown bits but he procrastinated handing them over and when I 'reminded' him about it at the college awards ceremony the next year my mum said sourcing these clothes wasn't my job to do... the thing was I was the next best thing to a sister for her at the time and the way I saw it I didn't think it was much different to blood (or otherwise) family going out on a limb to source outgrown baby things (her mum gave my mum a huge box of outgrown baby stuff when my sister was expecting).
If it helps the situation I'm autistic and see everything as black and white. Is my mum right or not?