Should I offer my sister in law milk

you can offer it like “hey if you feel as though you need it, i have extra breastmilk stored that i can give you just in case” then it opens the door for her to ask comfortably if she actually does need it instead of possibly coming off in a negative light

Offer it but in an open, no pressure kind of way. Like "if you're interested I have some stored for emergencies" but maybe also open the conversation to supporting her to build her own supply. Some women can be a little funny about it because it's another woman's milk but if you have that kind of relationship it would definitely be a kind gesture.

I personally wouldn't at this stage. She is still establishing her supply and needs to focus on that. Of course that's a nice gesture but to me it's the wrong timing

I commented on your post in the other group. But it’s too early to offer. She just had the baby, her milk will take time to come in and baby needs to learn to latch. It can possibly be discouraging, give her some time. When or if she starts expressing that she thinks she is a low supplier or doesn’t think she’s making enough then offer. But she JUST had her baby.

Just put it in the table if she ever needs it or if she have struggles with producing milk

I think that she knows you could probably help if she wants as your supply is established already. I would let her ask if she needs.

I wish i had a sister to help me with my supply my daughter is five months today and im doing everything i possibly can to keep up justttt enough supply for her i exclusively breast feed im hanging on as best as i can just one feeding at a time im able to get so your sister is very lucky to have that offering if she isnt able to get her supply or has problems

It's too early, but it's also a kind gesture. Just offer for emergencies when she's got breastfeeding established on her own.

I wouldn't at this stage. It's an incredible thing to offer considering you're still breastfeeding and may need it yourself. However like someone said, at this moment I would be there BF support in other ways. When her and baby are learning their groove, the latch. The trying times that come very early on.
Same reason why I'm glad I didn't have a tin of formula in the kitchen when I had my baby because it's really really hard and the fact that I didn't have that option means I'm still going now at 8 months.

I would leave her to get her own supply established and get settled into newborn life. Of she struggles at any point then maybe at that point offer the help out

When I had my 1st born, my milk took some time to arrive (also had an emergency C-section so I guess didn’t helped) and it would have helped my mind a lot to have breastmilk of a trust one to give instead of formula.
However support her more in a way to help her to establish her supply and help her to have trust in herself, bc this is the most important !