I think you are right about your SIL and infertility

Sounds like she was struggling with IF herself and when you became pregnant and had a child she was upset that you were experiencing so much joy and she was still dealing with IF. Unfortunately she took it out on your DS by avoiding him. I had a similar situation where a relative had two losses and when I became pregnant with my DS, she didn't attend my shower, baby's baptism, didn't see him until he was about 4 months old. The difference is I was aware of her losses and this explained the behavior, I understood this is how she had to deal with her own pain. It is too bad your SIL couldn't at least tell you or tell you through her husband that she just couldn't handle going to showers, etc. I have avoided situations myself where I knew I would only cause myself pain. Maybe now that she is pregnant she may be more open to talking about what has been going on with her and it might explain some of her behavior. It's a tough one, everyone deals with their grief in different ways, unfortunately her way may have come across as "not so nice". Hope everything works out for you and good luck on your TTC journey with #2.

Me 35
DH 41
DS 4.5 (natural miracle)
TTC #2 since Sept/06
Diagnosed High FSH May 07
Diagnosed Severe MF Sept07