Week 23 of pregnancy

Your baby this week

About 565 g (estimated weight; Source: WHO fetal growth charts (Kiserud et al., PLoS Med 2017)) — about as heavy as an anar (pomegranate, about 4 in across) (Source: USDA SR Legacy (FoodData Central) FDC 169134 'Pomegranates, raw': portion '1 pomegranate (4" dia)' = 282 g edible portion; SR28 FOOD_DES refuse 44% (Skin and membrane). As-purchased weight = 282 / (1 - 0.44) = 503.6 g.). Every baby grows a little differently.

How your baby is developing

• Blood vessels in the lungs are developing to prepare for breathing after birth.UNSW Embryology (CC-BY)
• The fetus may respond to loud sounds from outside the womb.UNSW Embryology (CC-BY)

How you may feel

• Continued weight gain is typical; Braxton Hicks contractions may be noticed occasionally.ACOG
• Backache commonly increases as the centre of gravity shifts further.NHS

Nutrition this week

• Iron — blood volume rises ~50% — iron demand climbs (Red meat)
• Calcium — fetal skeleton mineralising (Dairy)
• Vitamin D — calcium absorption + bone (Fatty fish)

When to reach out

• Heavy vaginal bleeding or passing clots.ACOG
• Severe or persistent abdominal or pelvic pain.ACOG
• Severe, persistent nausea or vomiting that prevents keeping any fluids down (possible hyperemesis gravidarum).NHS
• Fever of 38°C (100.4°F) or higher, or chills.WHO
• Severe dizziness, fainting, or a racing/irregular heartbeat.NHS
• Pain or burning when urinating (possible urinary tract infection).NHS
• A severe or persistent headache that doesn't improve.ACOG
• Sudden swelling of the face, hands, or feet.ACOG
• Visual disturbances — blurring, flashing lights, or spots.ACOG
• Fluid leaking or gushing from the vagina (possible ruptured membranes).NHS
• Persistent pain in the upper abdomen, especially under the ribs on the right side.ACOG

These apply to this week specifically. See the full list of urgent warning signs the CDC publishes for pregnancy and the year after birth.