Child mortality

On another note - a hint to remember: Children are the most vulnerable links in a chain. They die easily - from sickness, from cold, from lack of food and water. It's like a natural law. If you do dangerous things or go on a dangerous journey, they will be the first to suffer harm or not even make it to the end of what you planned to do with them together.
The smaller they are, the higher even the probability.

Related: 1, 2