I'm also using enfa S3. so far ok until these few days.
probably constipated coz not drinking enough plain water? my boy also constipation coz he doesn't like to drink water when cutting teeth, prefer to chew on solids only. managed to get him drink some water using a sippy cup. maybe novel or can chew on the straw ba.
my boy already got 6 teeth (4 at the top & 2 at bottom). now cutting another 4 (2 at top & 2 at bottom). then plus juz had vaccination yesterday. super cranky & sticky now. can't sleep properly. praying for this phase to pass quickly. tired. sigh.