how to know when baby is getting enough breast milk ? a 6 wk old

read this article, its awesome for this question

https://blogs.unicef.org.uk/2016/08/01/infant-feeding-interval/?scid=Android_MPBT_Referral

OK

my daughter takes the nipple out with her tongue and when I try to give her more shell just stick her tongue out is that a sign she is full?

Make sure they are making enough wet diapers and the rule of thumb I use is when the unlatch, they are full.