My wife became pregnant with our third child when our second was only ten months old. She was nursing our second at the time, but she always had a problem of not having enough milk even though both her and the baby wanted to nurse. She knew she couldn't nurse two babies at once, so three months into the pregnancy when our second was just over a year old, she weaned her off the breast milk completely.
Now our third one has been born (that makes 3 girls for us), and some people have told us to not allow the second to witness my wife breastfeeding the newborn because this would remind her of when she was nursed and make her miss mom even more (she already lost a lot of mom's attention in the past few months and especially in the past few weeks when the delivery happened).
Should we follow this advice and keep the second one away from mom when she nurses the newborn (which is very frequent) or should we allow her to see it?