Cute chicks ... Glad you joined us & have fun with your babies. Chicks tend to "chest" bump part of setting pecking order, continues into teenage years. They're a bit young yet 8wks would be easier but guessing ....#1 Splash Wyandotte, looks to be a single comb, possible pullet
#2 BLRW (Blue laced red Wyandotte) possible cockerel
#3 Lavender Orpington, possible cockerel
#4 Lavender Orpington, possible pullet
#5 EE (Easter Egger), possible pullet
#6 EE, possible cockerel
#7 BO (Buff Orpington) looking pullet but they're slower to mature
