Im somewhat new to chickens but I know that Welsummer’s are auto sexing, so i got confused since the line is more like a pullet but it’s not necessarily a V shape, but it being a mix breed explains it, I will say if you have any pictures of when you got them I could give an educated guess
I hatched them and don't have any pictures of when they were freshly hatched, but I do believe they are both pullets. I can't say whether the marking is an indication or not, just that as they age (now 5 weeks and 4 weeks) they both definitely seem like pullets.
When i bought my chicks (Before I bought 2, that was a learning experience lol) now i bought 2 more i noticed when we got them (they were 2 days old at the time) they both had wing feathers my cockerel at the time did not, it is now day 4 and they are growing wing feathers, although their growth rates may be due to their breed, buff orpingtons i believe if their growths were similar to yours they should be pullets, also are cockerels allowed in your community? Best of luck for them to be pullets~
Also I believe wing sexing is as good as eyeing it, it may be because my cockerel was a buff Orpington (wing sexing doesn't work for them, I believe not for mixes either as someone else already said lol) when my cockerel was a “day old” in the pullet bin in tractor supply we tried wing sexing it, and um- as you can tell it was not accurate at all!
