Belly mark?

[Mochelem]

I have 3 new babies Ive had them for maybe 3 weeks and they were new born's when i got them, anyways all 3 of them have a line that looks like a cut about 3/4 of the way down thier body on thier bellies... Is this where the Unbilical cord was, or is this somthing I should be worried about... Thx

[Spaniard]

Thats where the yolk was absorbed, no worries perfectly normal