5 Weeks Pregnant: Week-by-Week Guide

    5 Weeks Pregnant: Week-by-Week Guide

    At five weeks in you probably know you’re pregnant for sure or are on your way out to buy a home pregnancy test! By now, you’re a little late and your hormones may be causing you to feel tired or sick. To learn what to expect, explore our week-by-week guide to find out what’s in store for your baby and your body at 5 weeks pregnant and throughout your pregnancy.

    At 5 weeks pregnant:

    • Your baby is the size of an apple seed
    • You’re officially into the first trimester
    • The countdown continues: you’ve got 35 weeks to go!

    What happens during the 5th week of pregnancy?

    • You missed something — if you haven’t already noticed, you may be late with your period. It’s time to head to the pharmacy or shops and pick up a test kit.
    • Hello hormones — you’re starting to get the first hormonal effects, whether they’re sore breasts, fatigue or that dreaded nausea you’ve heard so much about.
    • Baby’s forming — the placenta’s under construction and in a position to start providing nourishment to your little creation.
    • Little layers of wonder this week, the embryo divides into three layers called germ layers. The outer one will become the brain and nervous system, skin, eyes, ears, and hair; the inner layer will form the lungs, intestines, bladder, and liver; and the middle layer will become the circulatory system, reproductive system, kidneys, cartilage, muscles, and bones. A healthy diet will nourish your baby’s growth, complemented with a prenatal supplement that has DHA to fuel brain development.

    What should I be feeling at 5 weeks pregnant?

    • Don’t expect to suddenly blow up like a balloon. This early, you’ll see little change to your tummy and if you have particularly bad morning sickness, you might even lose weight.
    • Your breasts will begin to ache.

    5 Weeks Pregnant Facts

    How big is your baby? Check out the chart below to find out!

    Baby Size at 5 Weeks
    Baby Weight Too tiny to weigh
    Baby Length Super small
    Baby Size Comparable to a citrus seed

    Week 5 Pregnancy Symptoms

    During week 5 of pregnancy, your body is adjusting to the new life it’s supporting. As your baby changes, you will too, and there are certain pregnancy symptoms you may experience at this time. Keep these week 5 pregnancy symptoms on your radar:

    • You’ll go through unusual cravings or just desire more of the things you like.
    • Your mouth may be tending to produce excessive saliva.
    • You will be fatigued.
    • If you don’t already have it, you’re likely to be feeling the effects of morning sickness very soon.


    Being 5 weeks pregnant is an important time for you and your baby. Get advice on how to adjust to this new stage from the experts at Enfamil.

    • Get enough protein! Protein is important for your baby’s development, particularly your little one’s brain. Make sure to get three servings of protein every day, which is equivalent to about 75 grams.
    • It's time to make a prenatal appointment. Your doctor can screen you and your baby for any health risks and make sure you’re doing everything you can to nourish the life growing inside you. Check with your doctor about any medications that you’re taking. Some might be OK, but others could be harmful to your baby and cause serious birth defects or miscarriage.
    • Morning sickness doesn’t stick to any clock. Expect to feel symptoms at any time of the day so here are some tips to help provide some relief over the next few weeks.

    Week 5 Checklist: Plan Your Pregnancy

    Be prepared. Explore our pregnancy checklist below and add these items to your to-do list this week.

    To-Do Complete
    Make sure to get enough nutrients (folate, iron, calcium, protein, vitamin C & D)
    Discuss an ideal pregnancy weight with your doctor
    Book a prenatal appointment

    If you’re interested in learning more about your pregnancy, explore our resources on pregnancy planning and what’s coming up through the first-trimester.