Do 10 month babies have 2 pay or 11 month year olds?

According to the Dodgers A to Z guide, under the "Child Tickets" section, "Children 3 and under can enter the stadium free, provided they sit on a parent's or guardian's lap. Should the parent or guardian want a child age 3 and under to have their own seat, a ticket must be purchased"

I believe if they can sit on your lap they do not need their own ticket.