I think for some children at a certain age in toddlerhood they become more weary of people. My daughter would smile and wave at anyone when she was a baby/small toddler and she hit 2 and became very shy and weary of people. I think it’s mostly normal and I always think it’s a good thing that my daughter is weary of people instead of happy to chat to anyone. She’s a good judge of character now at 4 years old. Monsters/being scared could just be something she’s heard and her imagination has started to increase causing her to be scared. That’ll pass when she gets more of a grip on her imagination
Oliver says this all the time. Think it's some of the cartoons he watches. He copies. It is just a phase. Try not to make a massive issue about it. I've noticed oliver so much more aware about everything this year xx