🤰 Third trimester
28 weeks pregnant
Your baby is about the size of an aubergine
By Emma Whitfield · Pregnancy & Baby Writer
Your baby at 28 weeks
The baby can now open their eyes and turn towards light. They're adding fat and their brain is developing the grooves and folds of a mature brain. Around a kilo now.
Your body at 28 weeks
You'll usually be offered an anti-D injection now if you're rhesus negative, plus blood tests to check for anaemia. Your bump measurement is tracked at each visit.
Common symptoms this week
- Stronger kicks and rolls
- Heartburn at night
- Breathlessness
- Occasional dizziness
Symptom lists are typical, never exhaustive — and having none of them is normal too.
Focus this week
Start your hospital-bag list and pack the essentials over the coming weeks — aim to have it ready by 36 weeks.
Week 28 checklist
- Attend your 28-week appointment: bloods for anaemia, and anti-D if you're rhesus negative
- Start the hospital bag list
- If you're claiming maternity pay, notice must be given by the 15th week before the due date — around now
28 weeks pregnant: common questions
What is the anti-D injection?
If your blood group is RhD negative, anti-D immunoglobulin (offered around 28 weeks) prevents your immune system reacting to a RhD-positive baby's blood cells — protecting this and future pregnancies. It's routine, safe and only relevant to the roughly 15% of people who are rhesus negative.
How big is my baby at 28 weeks pregnant?
At 28 weeks, your baby is approximately the size of an aubergine, about 37.6cm and around 1000g. These are approximate averages — every baby grows at its own pace.
What's happening at 28 weeks pregnant?
The baby can now open their eyes and turn towards light. They're adding fat and their brain is developing the grooves and folds of a mature brain. Around a kilo now. For you: you'll usually be offered an anti-d injection now if you're rhesus negative, plus blood tests to check for anaemia. your bump measurement is tracked at each visit.
Which trimester is 28 weeks?
28 weeks pregnant is in the third trimester. The first trimester runs to the end of week 12, the second from weeks 13 to 26, and the third from week 27 to birth.
Sources & further reading
This is general information, not medical advice — every pregnancy is different. For anything that worries you, and for all your antenatal care, speak to your midwife or GP. If your baby's movements ever slow down or change, contact your maternity unit immediately, day or night. Reviewed July 2026.