I think I have converted some of kids weight's wrong!!!!

After reading through the birth announcements, that had both pounds and kilo's, I'm pretty sure most of mine are wrong...

They were:

Jay.. 3.360kg
Tay... 3.155
Mason... 3.900
Zavier.. 3.745
Kane.. 3.995

What are these in pounds??

Any help would be SOOO welcome.. thanks!!!