Pregnancy week by week: Weeks 1 - 9

What’s happening in those very early weeks of pregnancy? A lot more than you’d think. It all starts with one tiny cluster of cells. In this video, we walk through the earliest stages of your baby’s development, from conception through week 9. In that short window, your baby goes from a microscopic blastocyst to something that’s starting to look unmistakably human. Here’s what’s unfolding behind the scenes: ✨ How your fertilized egg travels to the uterus and becomes a blastocyst, about the size of a pen tip 🧬 How those first cells split into two key groups. One becomes your baby, and the other forms the placenta and amniotic sac 🌱 What implantation actually looks like, as the blastocyst burrows into the uterine lining 🌾 What changes by around 5 weeks pregnant, when your baby is the size of a sesame seed and early organs begin to form 🧠 How the brain, spinal cord, and circulatory system start developing, and when the heart begins to beat 🫀 How your baby gets oxygen and nutrients through the newly formed placenta and umbilical cord 🐣 Why your baby looks a bit like a tiny tadpole at first. Totally normal 🍇 What shifts by 9 weeks pregnant, when limbs, fingers, facial features, and tiny earlobes become more defined. Your baby is about the size of a grape It’s kind of wild. In just a few weeks, one single cell transforms into a rapidly developing embryo with a beating heart and growing features. If you’re feeling amazed, overwhelmed, or both, that makes sense. This video covers: ✨ Early pregnancy development from conception to 9 weeks ✨ Implantation and blastocyst growth ✨ When major systems like the brain and heart begin forming ✨ How your baby changes shape in the first trimester If you’re early in pregnancy and wondering what’s actually going on in there, you’re not alone. A lot is happening, even if you can’t feel it yet. At BabyCenter, we’re here to support you every step of the way. You’ve got this, and we’re cheering you on! ✨ Track your baby’s development with the world’s #1 pregnancy and parenting resource: https://babycenter.onelink.me/nZLz/ko... ✨ Find courses to help you through your biggest parenting challenges. https://courses.babycenter.com/ Connect with BabyCenter: TikTok:   / babycenter   Instagram:   / babycenter   Facebook:   / babycenter   Twitter:   / babycenter   Pinterest:   / babycenter