12 WEEKS PREGNANT
Reflexes appear — tiny fingers can curl
Baby this week: about 5.4 cm — crown to rump · about 14 g
≈ 5.4 cm — about the size of a lime
Illustration enlarged for clarity — the amber marker shows true relative size
Your baby this week
- Basic reflexes appear, including fingers and toes that can curl
- The intestines, which briefly developed inside the umbilical cord, move into the abdomen
- The fetus's face is looking increasingly human, with a defined profile
- Most major organs are now formed and will spend the rest of the pregnancy maturing
Your body this week
- The risk of miscarriage drops notably after this point, which brings relief for many
- The uterus is now about the size of a grapefruit and may be felt just above the pelvic bone
This week's tip: The end of the first trimester is a common time to share pregnancy news, though there's no right time — do what feels comfortable for you.
Want the bigger picture — organ development, nutrition, scans and warning signs for this stage? See month 3: The first trimester finish line.
Sizes and milestones are typical ranges — every pregnancy runs on its own clock. Educational content; your prenatal care team's guidance always comes first.