Veteran games dev community manager & designer. Loves 
He/Him
Ahh, okay, so that was why you were using the cheat anyhow. Can you try removing 2 family members via edit household, add in the babies, then use the shift-click cheat to add the 2 people you removed? May work better adding sims rather than "baby objects."
Try adding the babies in the normal way when you edit the household from the edit world window. It may be using the shift-click cheat just isn't as stable.
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