Absolutely mikado, but a bright dc in the top 10%, exposed to a wide vocabulary could also demonstrate those skills so I'm not so sure it's a sign of being gifted as opposed to bright.
With teaching counting I didn't do it in the usual way. I attached numbers to items, stairs, groups of animals, toys etc and dd would also 'count' them. She started before she was 1 so at the time only a few numbers were recognisable words even to me, the other numbers were more her using different baby babble for each item she counted. And again in my mind once she understood the basic concept of counting single digit numbers anything else to do with larger numbers, basic manipulation etc is obvious.
I wasn't aiming to teach her to count, at the time I did it in the same way I said please and thank you, or told her the oven was hot. And same as any of those normal everyday things we might all say around a baby I didn't have any time frame in mind as to when she would understand them. I just assumed she'd learn when she was ready, and had no idea what was normal.
There were definitely clear indications from a very young age, I just didn't notice then that they weren't just typical bright.
There were plenty of occasions other people noticed but even then I put it down to her being bright and interested. And in some cases that dd had opportunities they didn't.
I know now if I hadn't been so young, and had perhaps researched child development, met more babies/ toddlers from a wider range of backgrounds I would have noticed. Certainly if I'd been on here and aware of the normal expectations at primary I wouldn't have missed it.