It is normal. It generally happens to derivative benificiary. If your son needs a stamp on his passport, you can make an appointment (via infopass) and bring the "welcome to USA" notice to Local USCIS office to get his passport stamped.
By the way, I had to go to local office to stamp my passport when my I-485 was approved. My wife received the welcome notices from TSC and received her GC in one week.
Good luck and happy new year!
By the way, I had to go to local office to stamp my passport when my I-485 was approved. My wife received the welcome notices from TSC and received her GC in one week.
Good luck and happy new year!
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