At 13months child should be able to walk with support , should be able to speak mama Pappa , uses gestures like waving bye bye or shaking head to say no , repeats actions or sounds what u do.
As per ur assessment of milestones ur child is doing pretty good.
Next Steps
encourage playfull activities with ur kid
try expanding kids vocabulary by interacting with ur kid
Need to assess his weight length head circumference dietary history and physical examination for a better idea about his growth and development.
u can consult in person for assessment.