Firstly, I really like the baby. 
Secondly, you think alike how I was imagining children in stonehearth in previous discussion. So I completely support this 
.
Although I would like to offer alternatives.
Parents get the first task to care for the toddlers. They get tasks like feeding and comforting when crying. This gets high on the prioity list. Higher than work, higher then sleeping. So parents gets less working time.
Later in the game the nanny can be created for optimal efficiency.
The teenagers might need some extra distincion from adults I think. Maybe bare-footed.