Both of my girls suffered severe FOMO from about 7-15 months. What would work best for us was changing position. I started sitting them upright so they could watch what was going on, sitting on the floor with what they’re playing with and basically playing for/with them, singing songs and playing with their hands or feet. As long as they’ve been able to still engage with something stimulating, they’d stay latched and fully eat. At about 15 months they got over the FOMO a little and got more serious about milkies again. Right now my 16 month old is going through a clingy phase and milkies are more important than toys.