allergic reaction?

JR • Mommy of four !!!!👦🏼👧🏼🧒🏼👶🏼
I started feeding my baby 6 days  ago. This is what I did (all home made purée) 
Sat: sweet potato dinner 
Sun: sweet potato dinner 
Mon: sweet potato dinner 
Tues: sweet potato dinner 
Wednesday sweet potato breakfast , banana dinner
Thurs: banana breakfast, sweet Potato dinner 
Fri: banana breakfast 
However he stopped pooping Wednesday so I got nervous and decided to try pears for dinner today (Friday) because I read they can help your baby go. And this happened : 
Is this an allergic reaction??? And is it the pears??? And what do I do?!?! 
Do I take him to ER (doctor office closed) or do I just monitor him. He's in a great mood! And is feeding off me now! Ah idk!! 

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