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One study Sufrin conducted found half of states allowed women who were incarcerated to have abortions in the first and second trimesters, but 14% did not allow them at all.

There are no gestational age restrictions, although most abortions are performed during the first trimester and those after 23 weeks require specialized care.

"This should've happened weeks and weeks ago and never been allowed to get to the stage where she is in the second trimester," her mother told the Royal Courts of Justice.

The 29-year-old has also endured a tricky pregnancy, with nausea and vomiting extending into her second trimester.

Babies get their earliest “vaccines” from their mothers, in the form of blood proteins that pass through the placenta in the third trimester.