If an embryo were ever evidence of our distant origins, then?
"...This reflex disappears after about 6 months of age..."
"...You may have seen videos of very young babies moving under water or heard that newborns have an innate swimming ability due to floating in the womb. These stories and videos are deceptive because a newborn cannot float or hold his head above water. Newborns do possess two reflexes that simulate swimming, which could make it appear that the baby is swimming.
Diving In: The diving reflex -- also called the bradycardic response -- involves a natural reflex for the baby to hold her breath when her head goes under the water. A baby's heart rate will also slow down while under the water. This reflex disappears after about 6 months of age.
Swimming Reflex: A newborn placed stomach-side down in water will move his arms and legs in a repetitive swimming motion. This reflex is called the "swimming reflex." The swimming reflex begins to fade at about the 6-month mark."
(Source)
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