Quick answer: The mothers body usually starts it but it is still a conversation between the two. They are looking into whether or not the baby can help start labour (as it does in sheep)
The mothers body will release hormones which help the uterine cells contract and makes these cells more receptive to oxytocin which again helps them to contract. This then helps create another hormone which tells the uterus to do the same.
This is all I remember from previous conversations with my doctor when I was pregnant so if I am wrong please correct me!
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