Oo, normal lang yan sa ganyang edad, lalo na kapag umakyat ang init! At 7 months, babies pa lang nag-aadapt sa temperature at di pa fully developed ang kanilang cooling system, kaya madaling ma-overheat especially during the day. A few of my mum friends and I noticed na ang babies natin ay napakasweaty sa gabi or early morning, and it's usually just because nag-adjust pa lang sila, pero kung laging sobrang init ang baby mo, mainit ang ulo or may rashes, better check with your pedia just to be sure!