I find it odd, and quite frankly, irritating that people insist on stereptyping boys/girls/blue/pink etc.
if it is now starting in infancy, then god help us all.
we went to stay with friends recently. it was bloody freezing, and ds (7 months) was wearing a snowsuit (in a rather fetching shade of plum). the very first thing friends said to ds? "oh, they've got you wearing pink, have they? that'll never do!" It was the first time they'd met him, but instead of cooing over his obvious gorgeousness (
), they commented on his clothes, ffs. and he is 7 months old!
I did, of course, rush off to check that hs willy hadn't fallen off, as I had clearly unwittingly set in process his sex change 
the next time they saw us, ds was wearing a different snowsuit (pesky babies do keep growing!) - this one in emerald green. they mentioned it was a better colour... what they didn't know was that that one was a cast off from dd2, and had a flowery lining
. It obviously hadn't occurred to them that green could be worn by girls...
it is so tedious. I really don't think there are societal norms when it comes to toddlers - aren't they famed for bonkers dressing anyway? such as wellies/tutu/fireman's hat combo to go shopping? surely anyone seeing a 2 year old in pink sparkly slippers in Tesco (or Waitrose!) would think they are from the dressing up box anyway? (due to non-suitability of said footwear for everyday, rather than any boy/girl angst)
and anyone who said anything to a 2 year old about gender stereotyping of clothing is clearly just a narrow minded bigot, tbh.