Firstly, it's your baby and whenever you have a concern act upon it. I would suggest you contact the nursery again today and ask to come for a visit again. Write down your concerns and address them with the manager. Ask yo see the baby room and have a chat with the room lead. That person may have a different take then the person you spoke to. Look at the equipment the hair chairs the sleeping arrangements and the kitchen where the bottles are stored. How many staff are in the baby room. I could go on but I won't