It is completely normal for a 7-month-old to be more interested in playing with, throwing, or turning over their food than actually eating it; this is a key part of their sensory development. Encourage self-feeding by modeling how you put food in your mouth and chew, and offer positive reinforcement when they mimic you. If your baby throws food, calmly state that 'food is not for throwing' and remove the plate for a moment to set a boundary. Be patient, as babies eventually learn to eat when they are hungry and curious.