John Gill Commentary 2 Chronicles 13:21

"But Abijah waxed mighty, and took unto himself fourteen wives, and begat twenty and two sons, and sixteen daughters." — 2 Chronicles 13:21 (ASV)

But Abijah waxed mighty
In his kingdom, increasing in riches and numbers, power and authority, and in his family:

and married fourteen wives, and had twenty and two sons and sixteen
daughters ;
not after the above battle, nor since he began to reign; for he reigned but three years; but he, no doubt, married wives and had children before he came to the throne, as he might have others after.