13 Weeks of Pregnancy | Second Trimester | Fetal Stage
At 13 weeks of pregnancy, the fetus’s intestines now grow within the abdomen rather than the umbilical cord [1]. The active fetus still moves uncontrollably, though it may be able to put its thumb into its mouth [2].
The fused eyelids protect the fetus’s developing eyes, which are moving closer together [2,3]. The ears start moving upward and lie flatter against the head [3]. The limbs continue to lengthen, becoming more proportional to the fetus’s body [1].
The external genitalia continue to form male or female characteristics but remain immature [1]. The liver will keep producing red blood cells until this process begins in the spleen [1].
References:
1. Moore KL, Persaud TVN, Torchia MG. The Developing Human: Clinically Oriented Embryology. Philadelphia: Elsevier; 2016.
2. Harms R, Wick M, editors. Mayo Clinic Guide to a Healthy Pregnancy. Boston: Da Capo Press; 2011.
3. Betts JG, Young KA, Wise JA, Johnson E, Poe B, Kruse DH, et al. 28.3 Fetal Development. Anatomy & Physiology. Houston: OpenStax; 2013.
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Produced and written by: Samantha Lattof, PhD MSc
Medically reviewed by: Ayodeji Olelakan Abere, MD MBA MHA
Animation by: SciePro / Pond5
Music by: audiomarket / Pond5
Narration by: Ava / Wellsaid
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Disclaimer: This content including advice provides generic information only. It is in no way a substitute for a qualified medical opinion. Always consult a specialist or your own doctor for more information.
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