Following Alan's post I went looking for Ernest, the older brother.
Possible baptism:
25 Feb 1883. Ernest Charles. Parents, Charles and Caroline Jane.
Baptism was in Harrow St Mary, but it appeared they lived in Sudbury?
Charles was a coalman.
Perhaps Caroline died and Charles married again? As Carol says, such a gap between the children often suggests differing marriages
[Sorry Deb - collided!]