Jacob went through this, and it does come to an end...eventually

It doesn't happen overnight - it can take several months in fact. Jacob would get hysterical. He went through separation anxiety with DH, and with me, at different stages.

Playing lots of peek-a-boo games helps them understand that if you disappear, you do come back IYKWIM? Also talking to them from the room that you have gone to etc etc. But at the end of the day, it is hard work.....poor little mites think that once they can't see you, you're gone for good - imagine how scary that must feel!