The credit is phased out 50 bucks per 1000 over 150k I believe. The more kids you have the higher the credit and the higher income you can have before it phases out.
Just make sure you put some money aside, because you likely will owe a little this next tax season.
Also, remember, the credit is still higher comparably to last year, 3000 (or 3600 if kids are young) compared to 2000 per child.