SPOILER ALERT
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The daddy is the Crown Prince (Mettel/Maetel). He is actually quite aware and suspicious of the symptoms Louis showed during the interactions. If you have read all of the available chapters, for better understanding, I suggest you to pay detailed attention to Maetel expression everytime he is with Louis. Thus, you will notice that he is aware.
Regarding your question, when will the baby daddy, in here it means Maetel, he will certain that Louis is pregnant around chap. 35.
Spoilers:
It's the prince, he's the daddy. And the murderer is the duke who have feelings for the uke, he's literally obsess.
Thanks
And if I'm not wrong the one who drug the uke was the duke but the uke somehow ended up with the crown prince.
Which 1 is the duke again is it the guy who confessed to the uke the babydaddys brother??
He appeared on chapter 6, the one with a brown hair. And yes he's the one who confessed to the uke.
Oh OK thanks for clearing that up
Can someone tell me when the baby daddy finds out he's pregnant and who the baby daddy is? Is it the prince? The one with the blonde hair? (￣∇￣")