First trimester
Learning Center
1st trimester pregnancy: What to expect
The first few months of being pregnant can bring physical and emotional changes, such as breast tenderness, nausea, anxiety and excitement.
Baby naps: Daytime sleep tips
Know when and how long babies need to nap, how to put them down for naps and how to handle fussiness.
Birth control pills: Harmful in early pregnancy?
If you took birth control pills before you knew you were pregnant, the risks of birth defects are low.
COVID-19 vaccines for kids: What you need to know
Learn about the safety and effectiveness of COVID-19 vaccines for kids, the possible side effects, and the benefits of vaccination.
Fetal development: The 1st trimester
Fetal development begins before you even know you're pregnant. Here's what happens early on.
Implantation bleeding: Common in early pregnancy?
Implantation bleeding is a common early pregnancy symptom. Understand why it happens.
Nausea during pregnancy: A good thing?
Morning sickness is common during pregnancy. Understand what nausea and vomiting might mean while you're pregnant.
Prenatal care: 1st trimester visits
Prenatal care can help ensure a healthy pregnancy. Here's an overview of first trimester visits.
Rett syndrome
This rare genetic disorder affects the way the brain develops, causing a progressive inability to use muscles for eye and body movements and language.
Toe walking in children
Walking on toes or the balls of the feet is fairly common in children who are learning to walk. Most children outgrow it.
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