Jelly, that does sound a bit choppy 
I had something to compare it to. dd1 started with half days and settled very quickly, no looking back. Happy, and saying 'my school', 'my class', 'my teacher' by the end of the first week. (She was not at the school's nursery, knew no one) She was ready for her full days in January, no problems.
Neighbour's child started at same time as dd, same age, same nursery - different school with different rules. Full days straight away. He came home and cried every single evening for the whole of the first term, and didn't like school (he did, but was exhausted).
Of course, his parents gritted their teeth and got him through it, and in time he stopped crying and 'got on with it' - but what a horrible start.
Not always like that, obviously, but just to illustrate why some schools think it matters to phase in slowly...