选maybe
翻译：这个正在哭的宝宝可能是饿了
解析：may be和maybe一分一合,但它们的含义和用法却截然不同.
maybe是副词,意思是“也许、可能”,相当于perhaps,
Maybe she’ll come this afternoon.她可能今天下午来.
Maybe you put the letter in your pockets.大概你把信放在衣袋里了.
may be,may是情态动词,be是动词原形,意为“也许是、可能是”.
I can’t find my watch.It may be in your pocket.我找不到我的手表了,它可能在你的口袋里.
He may be a soldier.他可能是军人.