1-health related lifestyle impact on female fertility in Saudi in Riyadh

2-Obesity in pregnancy : epidemiology and development of a lifestyle intervention in Saudi.
3-Antenatal depression and infant sleep : investigating the pathways to risk

i am confused about the three topics but i need to check whether the topic is suitable for phd or not also i want from you if we discuss the topics to paraphrase and modified any one of the above title but contact with me first .