My eleven month old is a very happy and confident baby - out and about he will wave and smile at strangers, he will be held by anyone and we have no issues leaving him with family members (no tears or upset when we go or are gone). Recently when a less familiar person has come into our house, he is unsure and clings to me more / not so sure about being held etc. but if we were to see the same person outside of our home, he would be fine. Any thoughts?