See "King Solomon's Ring", by Konrad Lorentz. He describes shuffling around his garden in a squatting posture, followed by a column of imprinted greylag goslings. They only recognised him as their mum when he was under a meter tall, hence the squatting.
I'm not sure that an 84-day-old bird still counts as a "baby bird"; don't most hatchlings fledge within 30 days or so?
When she took him in, it had closed eyes, so that still qualifies as "baby bird", and it "fledged" relatively soon thereafter, though it kept a social bond with the woman, even past adulthood, which would have been at least a few weeks later.
