there are lots of ways to promote development firstly you need to observe the child to find out their individual needs, age and stage of development then plan activities effectivly. For example to develop a childs gross motor skills at 6 months you may put them on a play mat on their tummy (search online for tummy time) and place toys slightly out of their reach to encourage crawling or movement.
using a range of reasorces, being a good role modle-bandura, helping a child to the top of a problem-scaffolding-piaget, putting things on a childs level, continuous provision, free play-maria montessori, allowing exploration-margret mcmillan, giving a wide range of experiances-francis frobel, stimulating safe environment, language rich environment + imaginative play-vygotsky, child led and semi structured activities.
activities which will promote holistic development-painting, sand and water play etc
activities, areas and reasorces to promote social, physical, interlectual, creative, emotional, spiritual/cultural/morel development in relation to their age and stage.
head shoulders knees and toes-2-3
work with parents and other proffecionals if needed, encourage healthy eating and sleep routiene, routiene in the setting promoting independance and confidence, using positive reinforcement when they develop a new skill-skinner
we promote childrens development so they can reach their full potential and develop the skills to be get through life, be confident, be indipendant and be accepted by society.
hope this helps you could also mention birth to three matters