6 Months: Trying to stand?

Came into the room one day and found Andre in this half standing position, hugging the rails of his cot. Is it time to stand? Hmm… not very possible leh. Moreover, he just learnt how to sit like only 2 weeks back? The elderly says 七坐，八爬，九发牙。 So shouldn’t Andre be like standing at 10 months?