Unfortunately it’s hard to tell what the exact gender is until around 3 months when the saddle (the tail feathers) is either rounded ( a hen) or long and pointy (a rooster) But what can help, is looking at the vent ( the butt) does it look like a bubble ( rooster) or not ( hen) another way you can try to find out is spreading the wing, if the feathers are all the same size, (rooster) or are they 2 different sizes (hen) hoped this helped!!
Bird in first pic-I need a picture of it standing . You have a pair of Cream Legbars, the cockerel being the lighter one and the Marans look like pullets
I think most are pullets, their little single combs aren’t developed much. If you see the combs getting very large or red or getting waddles soon then it is a roo. My pullets are 26 weeks and still barely have any comb development, so its usually pretty easy to tell. They are adorable though!