A shower for any child except the first one makes the mother to be seem very very poor or a person who doesn't value their material possessions.
A person who plans on having a family, more than one child especially, would keep their items so that the following children can use them too. Everything.
If a person just gets rid of all those baby things then they should be the ones to go out and buy and replace the items they received free the first time around.
It does make that person seem incredibly greedy and not a very good planner if they're pregnant, have other children, and they don't have everything they need.
SO no, a mother does not get a shower every time she gets pregnant. People will bring gifts to the hospital when the baby is born. That's what you get, those gifts. The other stuff you should buy yourself. IF IF IF you got rid of everything, or had a fire, moved and lost a bunch of stuff off the truck, or didn't plan on more kids and you simply had an accident and have nothing, then if someone offered to hostess a shower for you then I'd say it's the right circumstances.
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ETA
I've been thinking about this question. I'm a member of the LDS church, they teach that the more kids you have the more blessed you are...all my friends have at least 4 kids and some have 10, one has 12. I'm not especially active anymore.
I had a friend that was a super kind, sweet woman. She stayed at home with their 4 boys and longed for a little girl. Her husband worked at Walmart. He wan't a manager or anything but was requesting to be considered for management training.
She finally got pregnant with a 5th child. She hoped and hoped it was a girl and it was. She was so overjoyed. She was dirt poor. Having a husband make little more than minimum wage is hard enough on anyone but a family with 4 boys and another on the way...it was tough.
My friend and I thought we'd have a shower for her because those boys had worn out everything. She had a bed and stuff like that but they were so old...
We offered to host a shower for her. We let everyone know we were having it then sent out over 100 invitations to every lady at church.
We fully expected some would not come due to the "not the mom's first baby" thing but expected sisters to realize how much every little thing would mean to this mom.
Out of over 100 invitations only 1 person showed up. The only reason she came was because she was the Bishop's wife and felt she had to attend the activities. Not one other person even tried to RSVP.
It was completely humiliating for the mom to be and for me it reeked of selfishness and meanness. I asked several people who I'd respected before this shower, I asked them why they didn't even RSVP and they mostly said because having a shower for any situation except a first time mother was rude so there was never any assumption they'd be attending.
I felt so bad for this lady. She started begging her husband to transfer to any other store in the USA. They were gone before the baby was born. I never saw her again. She was so embarrassed. I had never really thought about showers for additional babies until then but I got a lesson in a big way taught to me.