David was so skinny that he was in danger when a stiff wind blew. Anyone who has seen the Disney movie Dumbo will understand.
One day when he was about 5 he came in after a hard day of playing outside. His legs below his shorts were all bruised up, as happens with little boys.
Mildred took one look and said "David, your legs!". He looked down at them and said "Yeah, they're fat, aren't they".