If babies are given more love and feelings by their mothers, they will deal better with stress and anxiety when they grow up , research has shown. The study of eight-month-old children shows even the very earliest life experiences can influence our happiness. Lots of mother love makes children form a safe bond with their mothers , so they are able to feel safe in relationships when they grow up ,and they will have better social skills and deal with life's difficulties. The researchers,  led by Dr.Joanna Maselko of Duke University in North Carolina,  studied the relationships of 482 eight--month - old  babies with their mothers during daily development. They studied how well the mother had dealt with her child's developmental text and how she had responded child's performance.Mental health was then assessed when the babies had grown up - at the average of 34. The more feelings and attention a mother gave to her child, the better her child would be. This kind of child had the lowest levels of anxiety, hostility and general difficulties. The research studied children who are   _  .
8 - month - old 8- day - old 8 - year - old 18 - month - old