Paediatricscommon
A term 9-month-old boy is brought to the child health nurse. Over the past six weeks he has begun to cry when his grandmother, whom he sees weekly, picks him up, and he protests loudly whenever his mother leaves the room; at six months he went happily to anyone. He babbles, responds to his name, points at the dog, plays peek-a-boo and is thriving on the 50th centile. His mother has recently returned to work and is worried she has "made him anxious". Which one of the following best explains this change in his behaviour?