Try and pop into the nursery unexpectedly ( not between 12 and 2 though as that is lunch and nap time) a good nursery should welcome you whenever you turn up without booking in advance - you will get a real feel for the nursery. All 'nurseries are aware of when a 'show round' is happening and the staff are told in advance of a parent/ carer visiting, so will ensure every thing looks amazing.
The curriculum- all nurseries, pre-schools and child minders are required to follow The EYFS for learning and development and plan 'next steps' for children to progress via a play based curriculum. Different nurseries will present their curriculum in different ways, but all will follow The EYFS.
The baby room specifically, check that the room manager and staff have had specific training for working with under 2's. The room leader should have a level 3 qualification. All will have PFA - paediatric first aid training.
The staff ratio is 1:3 in the baby room. Check this out on your visit- if the baby room ( or any other room) is not in the correct ratio - then absolutely walk away from the nursery!
If you also see the toddler and Pre - school rooms, then you should expect to see some messy activities going on and staff engaging with the children. It should not be a situation where things have descended into chaos. E.g scissors left out, toys just left discarded in the main thoroughfare. Do not worry about seeing messy children, unless they have snot hanging from their nose, food around their mouth or a soiled nappy that staff have noticed. Messy children equals deep levels of engagement and fun!
If your child is going to be staying and going into the pre-school room at aged 3- then you need to check that learning and development of The EYFS in pre- school is led by a qualified level 6 ( graduate) holding QTS or EYT/ EYP status. In my opinion, this is crucial in pre- school to support the children's learning and development for big school.
Ask in depth about the food and menu, who is the supplier or does the food come from the supermarket? I once saw a nursery advertise sausage stew on the menu. It turned out to be a tin of hot dog sausages, a tin of of veg, a tin of tomatoes and white rice - totally processed, which nurseries should not be serving.
overall, you are looking for a calm and clean environment.
Ratios are:
Babies/ under 2's 1:3
Toddler Room: 2-3's 1:5
Pre - School 3 to 5's 1:8 , but if a l person holds EYT/ QTS the ratio is 1:13 if they are working directly with the children.