A nine-and-a-half-month-old baby named KJ Muldoon from the US' Pennsylvania has become the first person in the world to receive personalised gene-editing treatment using a technology known as CRISPR. Muldoon has a rare metabolic condition known as severe carbamoyl phosphate synthetase 1 (CPS1) deficiency. He has so far shown no serious side effects to the treatment, as per doctors.