My child has just turned 12 months. He's always been smiley and a happy child and for the last few months whenever he has been apart from me or his father he would be very pleased to see us and smile and want cuddles when we came back. The last couple of weeks he's stopped doing this and when we come back it is like he has stopped realising we've been away. He's still smiley when we get him up in the morning or after nap time but not after being separated. I know a couple of weeks isn't much time but there is autism in my family so I'm worried. Is this normal, no longer being pleased to see us after time apart?