I understand what you're talking about. I haven't been back to the US since I announced my pregnancy there for Thanksgiving 09. My son is almost 2 now, and only my mother has met him when she flew to Inverness just after he was born. We're expecting again in August, and people back home are begging me to come home for a visit.
What really gets to me is the expectation that I have to get my toddler and newborn onto a plane after raising enough money for tickets for all 4 of us (maybe just three if the daughter is exempt). Most of my friends and family don't have young children, but because I'm the one that moved away, the expectation is that I come home to visit. I'm a parttime employee, soon-to-be fulltime mom, and my husband, though he works 40 hours a week, makes just enough for us to pay the rent, council tax, groceries, sofa payments, etc. We just don't have the money, and I still get the guilt trips. Sometimes I cry over it, it gets so bad, but there's nothing I can do. If they want to see me, I wish they would make the effort, take the time off work, take the money they earn from their nice office jobs and buy a ticket to come see me and the kids. Fair is fair, and I've already gone broke to visit them! And that was before the kids! Grrr.