16 month old regressing?

[El91]

Can it be normal for a baby to stop doing things they have previously learnt?
My little boy is 16 months old (14 months corrected) and within the last couple of weeks he seems to have stopped doing things he used to do, clapping, waving, peekaboo, shaking his head no etc.
I also feel like his eye contact is getting less and he isn’t really responding to his name anymore.
I’m just wondering if this can be normal or if I should be worried? I have posted before about autism worries due to him constantly twirling his hands but this has reduced loads and he barely does it anymore. My worries had went away for a while and now I’m worried sick again 😩
He isn’t saying any words at all other than mama and dada sounds, but he doesn’t say it in context.
I also have a 3 year old little girl and I’ve been looking back at videos of her when she was the same age and she was SO much more advanced, like a proper little girl whereas my boy seems very babyish still. I know I shouldn’t compare them but it’s really worried me now after watching the videos. Everyone keeps saying that boys take longer to do things but is this even true?
Has anyone had a similar experience and can offer any advice?

Widespread regression and loss of skills is not 'normal' development, no.

It is however normal for children to get bored of a skill/being asked to constantly show a skill and move on to something else. For example, it's quite normal when they first learn to clap/wave to do it all the time and for this to then drop away as they move onto something else.

Is he doing other things in place if these 'lost' skills or is he withdrawing/becoming less responsive?

If you are worried get in touch with your health visitor, there's no harm in having this checked out.

With regard to worrying, I know it's unavoidable, but he either has Autism or he doesn't. No amount of worrying will change this. No matter what he's still the same little boy.