Here are a few cleaner, more natural rewrites:
Polished storytelling:
I lost one of my twins in the delivery room—five years later, my son pointed at a boy in the park and said, “Mom… he was in your belly with me.”
Smoother viral style:
I lost one of my twins at birth… but five years later, my son said something in the park that stopped me cold.
Short hook style:
I lost one of my twins in the delivery room… then years later, my son made a shocking claim.
More grounded tone:
After losing one of my twins at birth, I never expected anything to connect them again—until my son said something years later that left me speechless.
If you want, I can also help you turn it into a full story post or make it less clickbait and more realistic/emotional.