I went through that phase from around 9-12 months up to about 5 years old. I've been told it's not abnormal.
My mum remembers when I was about 18 months old I was in my pushchair in a shop, and my mum went off to get something and I started to cry in panic and yelled ''Mummy!! !'' My brother was there too, and he tried reassuring me. I did calm down when he talked to me, and my mum soon came back and I was probably happy after then.
I remember when I was 3 I used to feel anxious sometimes at preschool when my mum left me there. I can almost feel that emotion now; I remember standing there worrying that my mum has gone, and not knowing whether to cry and scream or to just try to remind myself that she will be back in a couple of hours. I think I did cry in my first few months at preschool when my mum left, but after a while I still got the anxiety but tried to occupy myself with toys and playing with the other children, which made the time go quick.
Then I remember when I was about 4 or 5 we all had to have an injection at school, and are parents were allowed to come to sit with us whilst waiting and having the injections. I felt all at home when my mum was sitting there with me, but after I had my injection, she had to go, and I didn't want her to leave. I clung on to her and felt really anxious. I think I did cry a bit, and the teacher had to take me back to the classroom and I remember feeling happier again when I was sitting at a table back in the classroom doing some colouring with some other children. I wasn't the only one who got anxious that day - another girl also did, and was crying more than me.
I think it's because my mum always had that kind vibe about her, and still does now.
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Female