hi oakleaf, some aspects of development follow a definate sequence, like physical development babies learn to lift their heads before they can sit but the rate at what they do it at will vary between each child so some babies will sit up unsupported at 7 months while others may take a couple of months longer.hope this helps and what course you doing im doing cypw level 3 diploma if you are get yourself the
cypw level 3 diploma book by penny tassoni its excellent x