I dont think all playcentres make you stay (that wasnt worded how I mean). I am pretty sure you have to stay when they are under a certain age but then after that you take turns to be on duty so to speak.
If Emily is going to coffee groups and other preschool activities she will be mixing enough. Its bollocks (IMO) that they need to be socialising.....Its the mums that need the socialising
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You may want something when bubs comes along. I was in turmoil about that when James was due. I didnt want to "Send Tom away" but everyone was telling me I would need the break. In the end I started him at daycare a couple of half days when James was about 5 months and Tom would have been 21months. I did it because I could see Tom wanting more stimulation than I was able to do while feeding James etc. So for 2 half days I knew he was getting to do all the messy play and climbing, jumping etc that we dont really do at home. He LOVED it!!
In saying all this James is thriving at daycare too. I am back working part time so he goes for 8 hours a week and I have noticed a huge change in his confidence....possibly more than I ever saw with Tom. So each child is different