RE: SIL is thinking of NOT breastfeeding this time
Wow, that makes no sense to me, but I wonder if other people's opinions are part of what is bothering your SIL. Maybe she feels other people are pushing their reasons to BF? I wonder what she liked about breastfeeding and why she did it twice, and if thinking of HER reasons might spark a desire to BF again.
There's always the cost savings aspect. Plus, no waiting to warm a bottle in the middle of the night or with a crying baby, no running out of food at home or while out. And with BF, you can usually keep one hand free to eat your own feed, comfort an older child, read something, or operate a remote control, and that free hand is very important when there are other children running around. I'd think some of those reasons would be even more attractive to a second time mom.
If she wants other people to be able to give the baby a bottle, she could either pump or supplement with formula.
Advice and commentary on living overseas
DD1 15, DD2 12, and DS 9