Hi Sandrine,
I was working in the uk and was entitled to 6 months paid maternity leave but could take another 6 months on top without pay. I went back when the boys were 8 months. I had a FANTASTIC nanny who looked after my first child and consequently after my twins. What I can say is, if you want to be comfortable with returning to work, you have to have good childcare so you are not worrying every minute of the day. Helpers are not nannies. Most can provide basic care, only a few can offer the stimulation required. If I were you, I would either get a trained nanny or a really good nursery so you can get on with work without guilt or worry. my children go to school now and I am returning to work full time soon. i still don't like leaving them with the helper. She is wonderful but can't really stimulate and entertain them for a whole day. So I will have to plan activities during the school holidays for her to take them to so they don't miss out while mummy is at work! nannies/nurseries are more expensive than maids but it is money well spent. I preferred to save on other things.
Do your research well to make sure your baby is in the safest hands.
Best wishes
Lily