twinklets,
yr sil needs to stop breastfeeding before she TTC...the reason is when you're bf, due to 1 of the hormone, the eggs produces are of lower quality (bad eggs). You still can get preggie while bf...it does not mean no mense = no ovalution. In fact u do still ovalute but it's not regular coz of the hormones. Therefore, dun risk those bad eggs as everyone wans a healthy bb.
Tell yr sil to stop bf 1st then wait for mense to come...let body rest & hormones to build back up...it's quite fast thou....she can TTC straight after she stop bf, but dun try to TTC while bf, too risky for next bb.
Some ppl comes mense while bf, some dun, some come straight after they stop, some wait for 2-3mths then come.
For Paige's time, I drag the timing of pumping...mense come in Dec, I stop in Jan, preggie with Seth in Feb....so I had 3 menses then no more again, upto now...hehehe