There is nothing I love more than a white sleep suit. To me it is the symbol of babyhood. I know you can get white sleepsuits up to Aged 2-3. Years of pyjamas to come, but I've kept my children in sleepsuits until 3. Usually around the time when all of bedtime gets "grownup" - PJs, no more sleeping bag and toddler bed all usually happen around the 3rd birthday.
So I have got about a year and a half of snuggling my baby girl in her scrumptious white sleepsuit at bedtime.
Cookie - be aware that it is not a given that secondary schools will accept a child outside of his/her year group. Its a hard fight to get a primary to accept a delayed start child into reception class (rather than Year 1). The fight is much more difficult with secondaries, and parents have no right to delay the start of secondary.
Nazly - As mentioned, a child gets their government funded nursery place the term after their 3rd birthday (except when in receipt of some benefits, when the place is available from their 2nd birthday). Then starts school the September before their 5th birthday.
Some primary or infant schools have nurseries attached as part of the school (the primary my children go to does). When the child is old enough for the government place you can either transfer your child to this nursery or stay in your private nursery. The biggest positive of school-nurseries IMO is that they are staffed by actual teachers and teaching assistants managed by the school, very different staffing to a private nursery.
The downside to school-nurseries are that they usually have set hours, based around school hours. So child will either attend 9am-12pm or 12pm-3pm and attend either 5 mornings or 5 afternoons a week with no flexibility. Working parents around here usually find a private nursery or childminder who does pick-ups from the school nursery. That way the child can go to school nursery and still have "wrap-around" flexible childcare hours. The local private nurseries do mini-bus runs (not dissimilar to the Balamory Bus), dropping children off at school nursery and picking them up again afterwards.
Polka - how is sleep now? My money is on teething, hopefully it will sort itself out as suddenly as it started.