By the time your baby is seven months old most will be able to sit upright without support. They will reach for items with a sweeping motion and they are likely to have started imitating speech sounds. (Babbling). About half will start to make word-like sounds and will begin crawling or lunging forwards. The more advanced may stand whilst holding onto something and have started waving goodbye.
8 Months
Most will say "mama" or "dada" but, not necessarily to the correct parent. They will have begun to crawl and will start pass items from hand-to-hand. About half will now be standing with support, will crawl well and, will point to objects. The more advanced may have started to walk whilst holding onto furniture for support and will be pointing at objects they want. They will be picking up items with finger and thumb "pincer" movements.
9 Months
By nine months most will now be making word-like sounds and will be standing whilst holding onto something. About half will be using the "pincer" grasp to pick up items and, will be walking with the support of furniture, as well as banging objects together. The more advanced will play "patta cake" and will say "mama" or "dada" to the correct parent.
Remember, don't worry if your baby doesn't do everything along this time-scale, it's just a guide and everyone is different.