I try to do tummy time or like the bath and the infant sparkles but doesn't reach any milestones. Sometimes it'll just keep sparkling as if it's reaching a milestone over and over while it's hanging out in the floor or in the play mat. It's been like this since the recent update. I've never used mods or cc ever with my game so it's all organic.
I'm wondering if the information in this bug report may be helpful to you. I see several workarounds that helped players, plus if it sounds the same you can add your information and 'like' the original one for visibility and information for EA: https://forums.ea.com/discussions/the-sims-4-bug-reports-archive-en/open-gro-infant-won%E2%80%99t-achieve-milestones/11657874
Please use this thread: [GRO] Infant/Toddler wont achieve milestones | EA Forums - 5053288
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