Can't answer the questions as I'm currently going through solicitors to sort out supervised visits(long story)
BUT, with a LO as young as yours, you don't HAVE to let him stay... Try & remain amicable with FOB if possible and come to an agreement between yourselves that your comfortable/happy with. At that age its important he continues to bond with his dad, and depending on ur circumstances its up to you how often he sees him.. I'd probs say little and often for now. Again, with him being this young I'd keep contact at yours if thats what your happiest with for now. x