DS (4) has always been a reluctant attendee at preschool. Clingy and tearful when he first started. Settled in ok and began going in happily. Originally did 3 mornings a week. Upped to include a whole day on a Weds so to get used to having lunch at school before starting primary in Sept. Seemed to be going ok. Then just before Xmas he began getting very upset about staying for lunch and going all day. Has now regressed to tears/screaming and clinging on going in on a Weds. On other mornings when he's not staying he'll go without tears. I don't need him to go all day for childcare reasons as I'm at home that day. Should I persevere with all day or just drop it back to morning only? Not sure what would be best. Any suggestions?