And just recently, a 4T!
https://www.instagram.com/p/CC6BKmoq4fs/
https://www.instagram.com/p/CC6BKmoq4fs/
Nothing against aljona, she's a queen and a true champ, but your point being made about how it's miraculous that she even has skates on 10mos after popping out a kid is kind of outrageous. For an average person, what you said would be true, but not for someone at Savchenko's fitness level. It's quite easy for them to spring back into action not long after recovery from having child.
Adding onto what you said, skating coaches are quickly back on the ice coaching and demonstrating after having children. Whilst this is nothing like attempting 3A's (even in harnesses), they still "have their skates on", and are doing skating skills shortly after having children.
Anyone who follows Aljona's Instagram feed will know how hard and systematically she's worked over the last several months to rebuild her strength and skating form, so from that angle it's no surprise at all that she's doing this - but it's still impressive!