No matter how many times my sims achieve a milestone some of the family recipes wont unlock, fertility unleashed, illness immunity etc. Regardless of the save, family or other factors wont unlock.
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Ideas
For me the low maintenance special touch doesn't unlock. I locked the parents and the child into a room so that no one could wander of before I aged the child via birthday cake (toddler to child), so both parents definitely observed it. The child is an alien concieved as Science Baby, if that is relevant.
