The Playbook

12 Weeks Pregnant: What Dads Need to Know This Week

By the Guide to Fatherhood editorial team. Last reviewed . 2 min read.

Checked against guidance from organizations like the AAP, CDC, ACOG and NHS (linked below). This is general information, not medical advice. Read our medical disclaimer.

Trimester1
Sizea lime
Length / weightabout 2.1 in (5.4 cm), about 0.5 oz (14 g)

Fingers and toes have separated, the kidneys are starting to make urine, and the baby can open and close its fingers and curl its toes.

Your to-do list this week

  • Agree together on who you tell, when, and in what order. Grandparents first? Work? Social media last, if at all?
  • Go to the next prenatal appointment if you can. If first-trimester screening results are coming, be there for that call.
  • Check your employer's parental leave policy and your state's paid leave rules. Bookmark the leave planner.
  • Take over one recurring chore for good: dinner on weeknights, laundry, or the dog. Pick it and own it.
A conversation to have this week

"How do you want to tell people, and how do you want me to respond when they ask how you are feeling?" Some people want everyone to know about the nausea. Some want zero commentary on their body.

The baby this week

At 12 weeks, the baby is about the size of a lime, a little over two inches from crown to rump. According to Mayo Clinic, fingers and toes have separated, nails are starting to form, and the baby can make reflex movements like opening and closing its fingers. The kidneys have started producing urine. Your partner can’t feel any of this yet; it is still a few months until kicks are noticeable.

If there’s an ultrasound this week, you may see a surprisingly baby-shaped baby, with a profile, a big head, and limbs that move. It is a good one to be in the room for.

How your partner may be feeling

The end of the first trimester is in sight, and for many people the worst of the nausea and exhaustion starts lifting between now and about 14 weeks (ACOG). For some it lasts longer. If she can’t keep fluids down, is losing weight, or feels dizzy, that’s worth a call to her provider, because severe nausea and vomiting is treatable.

She may also feel a mix of relief and nerves as you get closer to telling people. That’s normal.

Telling people: a quick plan

Many couples share the news around now. Most early pregnancy losses happen in the first trimester, and by 12 weeks many have had a reassuring ultrasound. There’s no right week, though. Agree on three things before anyone finds out:

  1. The order. Usually close family first, then close friends, then work, then everyone else.
  2. The script. Decide how much detail you share about due dates, screening results, and how she’s feeling.
  3. Her say on her body. Some people love belly talk. Some do not. You run interference if relatives get personal.

Screening decisions

This is the window for optional genetic screening. According to ACOG, cell-free DNA screening can be done from about 10 weeks, and first-trimester screening (a blood test plus a nuchal translucency ultrasound) usually happens between 11 and 14 weeks. Screening tests estimate risk; they don’t diagnose. A result that comes back “increased risk” leads to a conversation about diagnostic options, not an automatic answer.

Your job: learn what each test does before the appointment, so your partner isn’t the only one holding the information. Ask the provider how and when results will arrive, and be there for that phone call if you can.

Start the money and leave conversation

You have about six months. It’s enough time to read your employer’s parental leave policy, check your state’s paid leave program, and start sketching how much leave each of you might take. It’s also a good week to run the first-year cost calculator together, so the money conversation starts with numbers instead of worries.

Frequently asked questions

Is it safe to announce the pregnancy at 12 weeks?

Many couples wait until around 12 weeks because most early pregnancy losses happen in the first trimester, and by now many have had a normal ultrasound. There is no rule, though. Some couples tell close family earlier so they have support either way.

What screening tests happen around 12 weeks?

Depending on what you choose, this window can include cell-free DNA screening (available from about 10 weeks) and first-trimester screening with a blood test and a nuchal translucency ultrasound (usually 11 to 14 weeks). Screening is optional; her provider will explain the choices.

Sources

  1. Fetal development: The first trimester, Mayo Clinic
  2. Prenatal Genetic Screening Tests, American College of Obstetricians and Gynecologists
  3. Morning Sickness: Nausea and Vomiting of Pregnancy, ACOG
  4. Early Pregnancy Loss, ACOG

We link to the original source for every medical and safety claim. Guidance changes; if a source has been updated since our last review, the source wins. How we research.