My 1 year old has a definite preference for oh and nursery staff and grandma. He had a horrendous colicky 7 months and only last month he seems to prefer others. He will happily play with me and laughs smiles babbles play peek a boo but if daddy appears it's like screw this I was being entertained until dad arrived. He has an older brother and I've been very busy with work I feel maybe it's my fault I need to change something any ideas ?