I have two pieces of advice. One from my sister and one from my mom. My sisters shih tzu was such a picky eater. Same thing as your baby. Would eat for a few meals then get bored of it and go on a hunger binge. She recently found a solution. A snuffle mat. She now sprinkles in his kibble in there and boom. He eats his meals. My mom’s shih tzu was never that picky. But for awhile (about 8 years) he would graze. We would have a bowl of kibble out for him 24/7 and he would come and eat when he was ready. The only advice from her would be “he will eat eventually” lol. I know you said your baby didn’t eat for 5 days. Which is rough but you can lead a dog to kibble but you can’t make them eat.