The problem with the “delayed” vaccination schedule is that then you get un- or under-immunized babies in daycare because the maternity/paternity leave runs out and the kid has to go to daycare. The way the vaccination schedules are currently implemented are done so to provide the best protection for the child on a timeline that would match up with the physiologic development of their immune system, the loss of immunoglobulin transfer from breast milk, and the exposure to more pathogens in environments outside the home.