My son is 5 1/2 months old and teething. Since he is so eager to put things in his mouth and knaw on it, I thought a teether biscuit would bring him some gratification. He's only had bananas, rice cereal, and sweet potato for solids. No teeth yet and can not crawl. My instinct says he'll just chew on it until it's mushy and swallow the mush, but I'm afraid it will break and he might choke. Advice? Just wait?