Both are a gender-flipped version of each other - the FL vs. ML believes their baby died, causing the couple to break up. The other parent (father vs. mother) raises the child alone and five years later they cross paths again, with the other parent suspecting and trying to confirm if the child is their's.
Both are about a rich ML and poor FL who are planning to get married only to be driven apart due to scheming by the ML's mother/se=mother. Five years later, the couple crosses paths again, and the ML discovers the FL has a daughter who he instantly realizes is his. Both children are cute and precocious, befriending the ML even more he realizes they're the FL's child.