The nursery "les ptites frimousses" sounds perfect for you - for chlidren 12 months - 3 yrs, open 9.30-5. It is located at the Mont dArbois cable car. Prices start at 30 for a half day and you have the option of a meal.
Or there is the creche MegLoisirs for children aged 1-12 yrs which offers day or half day, with or without meal. Reservation is required for this creche.