Trimester timing and why the cutoffs are useful In standard obstetric usage, the first trimester runs from conception through about 13 weeks, the second trimester from about 14 to 27 weeks, and the third trimester from about 28 weeks until…

The short answer No specific intercourse position has been proven to improve the chance of conception. Medical and consumer fertility sources consistently state that there is no reliable evidence that missionary, rear-entry, side-lying, or any other position guarantees pregnancy or…

Why ovulation is necessary for natural pregnancy Ovulation is the release of a mature oocyte, commonly called an egg, from the ovary. For natural conception to occur, sperm must encounter that egg in the reproductive tract and fertilize it. Without…

What the myth gets wrong The myth usually sounds absolute: cosmetics will harm the baby, so they should be avoided completely. That message is understandable because pregnancy increases attention to anything that might cross the placenta or affect fetal development.…

Why the myth persists The myth that rest is always required in pregnancy persists because it contains a partial truth. Pregnancy is metabolically demanding. Blood volume expands, cardiac output rises, respiratory physiology changes, joints and connective tissues become more compliant,…

Why the myth sounds believable It is easy to see why this myth persists. Sleep is not passive; during sleep, the infant brain is organizing experience, strengthening some neural connections, and pruning others. That makes sleep feel like a direct…

What the question really means When people ask whether thoughts influence pregnancy outcome, they are often really asking whether fear, sadness, guilt, or hope can directly shape the fetus. The evidence does not support a mystical or instantaneous connection in…

Why the myth feels believable The myth persists because pregnancy makes every emotion feel high-stakes. When you care deeply about the baby, it is natural to scan for cause-and-effect: I got scared, then something must have happened inside me. That…

The short answer: anger is not automatically dangerous The phrase “anger is dangerous in pregnancy” is too blunt to be medically useful. Emotions are part of human physiology, and pregnancy does not make every difficult feeling harmful. A brief argument,…

Temperament is not the same as personality When people say a baby has a “personality,” they often mean an early pattern of behavior: easy to soothe, highly alert, shy, intense, calm, or curious. In developmental medicine, this is usually called…