This is very true, for young children. Young children are innocent so hence they can see angels.
I'll share my little story.
I knew somebody from my old church who was dying in hospital. His family was all around him, praying with him until died.
And one of the little girls (she was about 4) asked her mum who 'all the people' were. Her mum was
and asked her 'what people?'. The little girl said that she could see a lot of people in the room, over 20, when their was only 5 or so.
I mean, you can say 'oh yeh she made that up' and whatever. But honestly, this little girl could see 'people' (angels). I doubt she'd have made that up. Believe what you want to believe. But I'm believing the child.