Week 13
Your baby is the size of a Lemon
Baby Size
Lemon
Length
2.9 in (7.4 cm)
Weight
0.81 oz (23 g)
Trimester
First Trimester
Your Baby at Week 13
Welcome to the end of the first trimester! Your baby is the size of a lemon. The placenta is now fully in charge of hormone production, and the risk of miscarriage has significantly dropped.
Key milestone: The baby's vocal cords form. The placenta is fully functional. Intestines move into the abdomen.
Your Symptoms
Energy returns. Nausea subsides for most. Visible bump. Reduced pregnancy anxiety for many.
Tip for This Week
Congratulations — you've completed the first trimester! Celebrate this milestone.
Your Body at Week 13
During the first trimester, your body is working overtime to build the placenta and support rapid embryonic development. Hormones like hCG, estrogen, and progesterone surge, causing many of the symptoms you're experiencing. Your blood volume is already increasing, and your uterus is beginning to expand — even if you can't see it yet.
Your baby at week 13 is the size of a Lemon, measuring about 2.9 in (7.4 cm) and weighing roughly 0.81 oz (23 g). The focus is on forming all major organ systems that will sustain your baby through the rest of pregnancy and beyond.
Your Baby's Development This Week
Welcome to the end of the first trimester! Your baby is the size of a lemon. The placenta is now fully in charge of hormone production, and the risk of miscarriage has significantly dropped. The key milestone this week is that the baby's vocal cords form. the placenta is fully functional. intestines move into the abdomen.
The first trimester is a period of incredible transformation. From a single cell to a fully formed fetus in just 12 weeks — your baby's development is happening at an astonishing pace. Each week brings new organs, new abilities, and new reasons to marvel at the process.
This week's voice theme
“A voice waiting to be heard — the silence before the first word.”
Imagine hearing this every morning — a voice note from your baby that evolves week by week.
Hear your baby's voice →Frequently Asked Questions
What happens after the first trimester?
The second trimester (weeks 14-27) is often called the 'golden period' — energy returns, nausea fades, and you feel the first kicks.
Is it normal to still have symptoms at 13 weeks?
Yes, some women continue to have symptoms into the second trimester. Everyone's journey is different.