mule, mewl

Mule or mule means the offspring of a horse and a donkey, known to be strong and stubborn--
After the Civil War, many freedmen received 40 acres of land and a mule.
The mule is a sterile hybrid; you need another horse and another donkey to produce another mule.

Mewl or mewl ( rhymes with mule ) means to fuss or whimper like a baby--
This is drivel, he might as well "mewl and puke in his mother's arms" as write such stuff.
He thought he heard the mewl of a baby, but he didn't find anything.

Now that you know that, you can say--
"He can be stubborn as a mule; he will mewl like a baby until he gets his way."