Launch had been planned for early February, but it was delayed to repair a hydrogen leak and, more recently, to give engineers time to fix a helium pressurization problem in the rocket's upper stage. Launch is now on hold until at least April 1.
Bell's successful womb transplant from a deceased donor is just one of 10 such transplants taking place as part of a UK clinical research trial. Three have already been carried out, but this is the first baby born.
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