APY is a guy – this is like that old joke where a child was injured and brought in for emergency surgery and the doctor
said, “I cannot operate on this boy; he is my son.”But the surgeon wasn’t his father, so how do you explain this?
(Answer: the doctor was the boy’s mother).
There is nothing wrong with a sling. If it is tzniusdig to carry one’s baby in her arms, it is no less tzniusdig in a sling. And how do we know our Bubbas did not use them in the alteh heim? I think they did! Only in those days they were shawls and big kerchiefs or aprons, not Baby Bjorns.