I suspect this status quo will continue for a chapter, maybe two. Then at the end of said quo, a new child will appear. Maybe even, if the mangaka is being feisty, a set of young triplets which all end each other's sentences and all have one-letter-different names.
Likely, it'll just be another 'cover girl' to act as the rival for affection.
What's with this creepy age-gap trend? That only ever works with Yuri.