She wanted to ask her daughter (1 year and 3 months old) about her umb…

She wanted to ask her daughter (1 year and 3 months old) about her umbilical cord, which is 2 cm long initially. It was large at first, according to the neurologist, who said it had been pulsating three times. She's fine, she says each time for two halves of a year. It normally grows back after that. She says someone else has experienced something similar, so what should I do? Give vitamin D3.