Hello. Our 6 3/4 month old baby boy: He sweats only while nursing. Other wise we haven't noticed any blueness anywhere, and he doesn't seem to get fatigued when he bounces on his feet about 6 times in a row repeatedly, about 3 to 4 times, laughing and screaming. However, he still hasn't drank over 2.5 to 3 ounces in one feeding on the bottle. He's in the 18th percentile for weight, but doc. says he's still developing healthily. Heart related concerns?