Board Thread:Spoilers!/@comment-25375217-20150309010607/@comment-25926288-20150309015633

The egg is the symbol for fertility and it housed true love. I'm sure the immortal dragon witch could use traditional methods for conceiving a child, but think about it...

David puts True Love Egg in Maleficent dragon. She returns to David and Snow (after some time) and says she's pregnant. Unless Maleficent's backstory falls between Snow's sleeping curse and Snow's wedding, I doubt she had time to find available suitors since Stephan already had Aurora years prior.