Is there a difference in when morning sickness starts if pregnant with a girl?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Morning sickness typically begins around the same time in pregnancy—between weeks 6 and 9—regardless of whether you're carrying a boy or a girl. However, some research suggests the severity of nausea may differ based on the baby's sex. Studies indicate that people carrying girls may experience more intense or prolonged morning sickness, potentially due to higher levels of hCG and estrogen hormones. That said, timing of onset remains consistent across both sexes, and individual experiences vary widely.

If you're experiencing morning sickness and want clarity on your symptoms, a quick symptom check can help. It's free, instant, and completely online—no signup required. Understanding what's driving your nausea, whether it's typical pregnancy-related or something needing further attention, empowers you to make informed decisions and know when to consult your doctor. Taking a few minutes now could save you hours of worry later.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn if morning sickness needs care now Discover likely causes of your morning sickness Find out what your nausea may mean See OTC options for morning sickness relief Find a doctor for pregnancy nausea Understand home remedies for nausea in pregnancy Check if this could be hyperemesis gravidarum

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Explanation

Studies have looked at whether morning sickness starts earlier or feels more intense depending on whether the baby is a girl or a boy. Some research hints that women carrying girls might experience more intense or prolonged symptoms. However, when it comes to the timing—the point at which morning sickness begins—there isn't strong evidence showing a clear difference based on the baby's sex. Overall, morning sickness usually starts in the first trimester of pregnancy for most women. While a few studies noted differences in the severity of the symptoms, they did not find that the sickness started earlier in pregnancies with girls compared to those with boys. Remember, each pregnancy is unique, and many factors can affect when and how you experience morning sickness. If you're concerned about your symptoms or want to better understand what you're experiencing, you can use Ubie's free AI-powered symptom checker to get personalized insights before talking with your healthcare provider.

(References)

Chan RL, Olshan AF, Savitz DA, Herring AH, Daniels JL, Peterson HB, Martin SL. Maternal influences on nausea and vomiting in early pregnancy. Matern Child Health J. 2011 Jan;15(1):122-7. doi: 10.1007/s10995-009-0548-0. PMID: 20012346; PMCID: PMC4182010.
Lee NM, Saha S. Nausea and vomiting of pregnancy. Gastroenterol Clin North Am. 2011 Jun;40(2):309-34, vii. doi: 10.1016/j.gtc.2011.03.009. PMID: 21601782; PMCID: PMC3676933.
Young NR, La Rosa M, Mehr SA, Krasnow MM. Does greater morning sickness predict carrying a girl? Analysis of nausea and vomiting during pregnancy from retrospective report. Arch Gynecol Obstet. 2021 May;303(5):1161-1166. doi: 10.1007/s00404-020-05839-1. Epub 2020 Oct 24. PMID: 33098451.

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