5 Stages Babies' Bones Develop in the Womb

Important Developments in the Hardening of Babies' Bones in the Womb

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The Womb

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Ossification

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Cartilage

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Hardening and Mineralization

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Fetal movement

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After Birth

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Adolescents

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Important Developments in the Hardening of Babies' Bones in the Womb

The Womb

Bones begin to develop in the womb during the first several weeks of pregnancy

Ossification

Primary ossification centers occur in the long bones during the 12th week of pregnancy

Cartilage

The spongy cartilage skeleton progressively changes into solid bone as the pregnancy proceeds.

Hardening and Mineralization

The bones begin to stiffen and mineralize around the end of the second trimester (about 20 weeks)

Fetal movement

The motions and interactions of the fetus with the environment contribute to bone strength

After Birth

Throughout childhood, the bones continue to develop, strengthen, and remodel

Adolescents

The process of bone formation and growth lasts into puberty.

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