Starting On Solid?

My baby is already showing interest in food and tried using a puree spoon to feed her milk and she can eat with spoon comfortably and learnt quite quickly after the 1st attempt. Her head can lift up straight which we can carry her upright. She constantly wanted to be seated upright otherwise she will cry angrily (still kind of wobbly and unable to sit up without assistance). She's only 4 months now. Advisable to try feed a little cereal to test it out?