Yes, I agreed with CMMANDY. My daughter is also take care by my friend's mother (around 50yr) from Mon-Sat (5.5days - full day) and sleep at those friend's home. And we only take care my baby on weekend. Charge around $4500, if your baby just take care on day time, charges around $3500/month. (not including Milk & Diaper).
I think that baby is taken care one by one is better.