Hello girls! My daughter is 6.5 months old, today our sister-in-law ca…

Hello girls! My daughter is 6.5 months old, today our sister-in-law came and wanted to hold the baby, play with her. As soon as she took her in her arms, the baby started crying very loudly, and then she cried. Her umbilical cord was pulsating strongly, then I calmed her down, and everything is ok!!! Why did the umbilical cord pulsate so strongly? Is this normal???