Depend on each child, I know I was still super clingy to my mother until at least 5 years old 😅. My 21mo is fine during the day but at night she still insists on sleeping with me. It's a normal development in children so we just have to face it I guess
https://sg.theasianparent.com/helping-your-child-deal-with-separation-anxiety
Hi, It develops with time I think. Just need to be a bit patient for it