decision on whether to weight regression model

[Paula de Souza Leao Spinola]

I am studying the impact of a particular policy on the number of hospitalizations of up to 1 year old children (children in their first 12 months of life). My data is collapsed by municipality and a indicator variable for 12 months before vs after the policy took place. My question refers to whether I should weight the regression by the number of children who are up to 1 year old. I understand that if I was studying the effect on the hospitalization rate I would do so in order to get a representative population effect. However, I am not sure if I should do so when my dependent variable is an absolute number (and, thus, larger municipalities will tend to have higher number of hospitalizations - hence, this representativeness is already taken into account by construction).

[Carlo Lazzaro]

Paula:
I'm not clear whether your database includes also chldren younger and/or older than 1 year.

[Paula de Souza Leao Spinola]

Hi Carlo. I have just edited by post above to be clearer. My dependent variable is hospitalization of children in their first 12 months of life. My dataset contain information of children of up to 12 months old.

[Carlo Lazzaro]

Paula:
I would not weight.