Early waking infants

Early waking in infants

Hello

How do you overcome early waking infants.

My 15 month grand daughter wakes around 4.30am most days and is then ready for the day.

She has an early nap around 9-10am as she is so tired.

Parents are trying to keep to one nap to help her sleep longer at night!

In bed and asleep at around 7pm.

Help….