New Delhi, Oct 13 (ANI): According to experts, birth of the first child can be the ultimate test of a couple's relationship, no matter how strong it was before the child come along. The study, which was conducted at the Murdoch Childrens Research Institute, researchers questioned 1500 new mums regarding their sexual health and intimacy. The findings of the research showed that majority of the respondents felt less physically and emotionally content in their relationship post childbirth, and they were largely unprepared for the changes.