Seems slightly premature to me ifur not due till December and staying with baby till September. I'd leave it till after babys born personally. Although it might be worth checking with you local childcare info services to see if there are huge waiting lists for whatever type of childcare you're planning on.
My baby is due at the end of November and I already have a part time nursery place booked to start in June. It's been booked for a few months already. The nursery I chose got an outstanding ofsted report which means it is very over-subscribed. I got one of the last places for one of the days I needed.
In an ideal world I wouldn't need a nursery place at 6 months old but sometimes there is no other option.
I'm not sure whether childminders get booked up as quickly though
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