I definitely experienced extreme morning sickness, which last all day. (stressfreemommies.com)
Third trimester symptoms are often more challenging than other stages of your pregnancy unless you had extreme morning sickness in the first trimester. (pregnancy-info.net)
Women who experience extreme morning sickness during pregnancy are three times more likely to have children with developmental issues, including attention disorders and language and speech delays, than woman who have normal nausea and vomiting, a UCLA study has found. (sciencedaily.com)