My just turned 3 year old boy is absolutely obsessed with numbers and has been since he was I would say 18months old.
He can can count way beyond 100, it takes me ages getting anywhere when out with him as he’s reading number plates on all the cars, pavements and numbers in shop windows and just about anywhere with a number he will find it!
He recognises numbers in the hundreds and even thousands, usually getting them right. Can do basic math like 2+3/4-3 etc
Is this a normal phase? He’s not showing any other signs of being autistic, he’s a happy boy loves playing with other kiddies, has a good vocabulary and eye contact. Just from the moment he wakes up to the moment he goes to sleep (sometimes with his numbers!) he’s mesmerised!