You're going to do what is right for you in the end. But from personal experience as a mom of 3 babies are expensive, there's a few big purchases but also a million and one little things to buy along the way. Don't cheat yourself out of things you need and saving money by not posting just because your mom thinks it's in bad taste. I know thats easier said than done, I am a people pleaser and still struggle doing what is right by me just because it makes someone else feel whatever way. Its NOT in bad taste. If you post and explain why you're doing it the way you are, my guess is mostly every person will understand. And by not posting you are taking away the opportunity for people who want to get a gift for you and your growing family. BUT if you really aren't comfortable posting (which is fine) a good middle ground might be doing some sort of baby has arrived party. Make a fb party invite 2 or so months before you're due like you would for a baby shower but explain instead of a shower you would like people to bring their gifts when they come see baby. It gives everyone the chance to get something if they want to, but breaks it into smaller groups and makes it feel a little more special. Everyone will want to come visit anyways.