High-Risk Pregnancy

Fetal Head Circumference Dropped Percentile

Hi all,

Looking to hear others who may have had or be having a similar experience.

At my 20 wk ultrasound baby's head circumference was measuring in the 80th percentile. I'm 29 weeks now and my midwife suggested an ultrasound because baby's heart rate went from 110 to 130 during my visit. Heart rate was fine at the second ultrasound but her head circumference was now in the 4th percentile.

I went to see a maternal fetal medicine doctor who assured me that "the baby is fine", but such a big drop in percentile has got me really worried.

I'm wondering if there is even a chance her head was just on the verge of a growth spurt and come my next ultrasound in 4 weeks things will seem back on track. No indicators for anything being wrong, all genetic testing was normal.

Freaking out a bit and again wondering if others have gone through something like this.

Re: Fetal Head Circumference Dropped Percentile

  • Trust your doctor that everything is fine. Ultrasounds in later pregnancy are more inaccurate.

    My baby's head circumference was good at my anatomy scan, but all subsequent scans his head has measured pretty small. In fact at my 36 week scan it was only in the 2nd percentile. He's so far down into my pelvis that they can't get a good measurement at all. My OB has never been concerned as his overall percentile has been good.
    *TW* History:
    Me: 34 DH: 36 | Together since 2007 | Married July 2016

    TTC #1 since 7.2017
    Dx: low morph (1%), ANA positive, low decidualization score, high TSH and testosterone, histone antibodies

    IUI #1-3 all BFN
    IVF #1 | 6.11.19 | 24R, 17M, 15F, 6B, PGT-A tested - 5 normal, 3 girls & 2 boys
    FET #1 | 9.10.19 | BFN "I know you, but we've never met. I'm with you, but I don't know your name"
    RPL, Receptiva, & ERA testing | all normal/negative, recommended going on gluten and dairy free diet for next FET
    FET #2 | 3.31.20 | Opted to cancelled due to pandemic, continued diet and tried naturally over the summer
    2nd Opinion with another RE | 8.20.20 | Not immune to measles (received 1 dose); SA results similar to 2 years ago; decided to move forward with FET #2 redo at start of next cycle
    Surprise natural BFP! | 9.22.20 | MC 10.23.20 at 8 weeks
    TTCAL naturally | starting 11.22.20

    Initial consultation with Reproductive Immunologist | 9.14.21
    Decidualization score biopsy | 10.1.21 | abnormal - low score of 1; endometrial scratch recommended and progesterone supplementation
    Saline sono | 10.15.21 | normal
    Bloodwork | 10.21.21 high TSH, high testosterone, positive for anti-nuclear antibodies and histone antibodies, high protein S, multiple genetic mutations
    BFP! | 11.3.21 | EDD 7.14.22 B) | biopsy provided same effect as endometrial scratch; added supplemental progesterone and estrogen, prednisone, levothyroxine, and MTX Support to maintain pregnancy
    DS born 7.19.22 after induction

    TTC #2 begins 6.2023
    Consultation with RI | 6.6.23
    Saline sono, endometritis biopsy, skin & eye check | all normal
    Labs | high TSH, Factor XIII mutation, high %CD56
    Follow up | 8.8.23 | prescribed metformin, prednisone, plaquenil, and levothyroxine
    Repeat labs after 3 weeks on meds
    Follow up | 11.9.23 | Green light!, increase in prednisone, added lovenox
    Repeat labs in 8 weeks
    Follow up | 1.16.24 | Green light continues
    TTC put on pause
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