I imagine it varies a bit, but my girls both blue their juvenile coat while they recovering from their spays, which would've made them 5 months old at the time. I really didn't see any difference between Gaz (my Holland)'s baby and adult coats; Nala (my lionhead)'s coat stayed just as silky-soft... however, she turned out to be a single maned lionhead, not a double, so she lost her skirt and her mane thinned out a TON when she got her adult coat.