That's very true.
It's why Let Toys be Toys movements are really important.
One thing I've found when setting up for this baby is how the slogans on babygrows are increasingly gendered and stereotypical.
There's loads for boys about roaring like a lion, being loud, being a rascal, being a cheeky monkey, being a heart breaker. Then there's lots of dinosaurs and science and cars as well. The message being that little boys are loud, boisterous, a hurricane of disruption who will probably grow up to work in STEM and will like cars.
Meanwhile in the girls' sections the slogans are about being pretty, being kind, liking cuddles and kisses, being an angel, being cute or fashionable/stylish like mummy. Then there's lots of references to princesses and dancing. The message being girls need to be nice and look pretty.
People I've said this to have said it doesn't make a difference because it's just newborn clothing and they won't know the difference, but I have tried to point out that it does make a difference if the adults around the child hold those views.
I'm hoping people don't wait til baby's arrival and then jump on the pink/blue train.