Cartoonist C.H. Greenblatt, the creator of Harvey Beaks, has hinted the very exciting news in a post on his official Tumblr blog, Nerd Armada, that Harvey's baby sister will hatch from her egg in a brand-new episode premiering in June 2016 on Nickelodeon USA!:
"Hi Carl! I have some questions about Harvey's little sister. What will be her's name? What she will looks like? If she's head will be also as big as Harvey's? How about her's character?"
C.H. Greenblatt: "You'll have to wait until June to find out :)"
UPDATE: Fans will also get to see Harvey's grandparents for the first-ever time when the baby is born!
Additional sources: Wikipedia, Harvey Beaks! Wiki.
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