The last few nights my 8 week old is missing nightfeeds. He's gaining weight fine and hv said to just go with his lead and feew how much and however much he wants. He is generally in 4oz every 3 to 4 hours but sometimes he guzzles down the full 4 and others he barely makes it to 3oz. I want to up him to 5 ounce to make sure he's not missing that first night feed but he doesn't seem to need it as seems content after most bottles he does finish. Should I be concerned? Should I persist with trying to get him to take more milk at least on the running up to bedtime?