As infants grow, their skills also grow. Parents should expect their child's motor development, both gross and fine, to develop at a rapid pace, with the gross developing first.
Children develop in a sequence, which is pretty universal.
The average child will grow approximately four to five inches every year for the first few years. Also, by twelve months the child will be eating a variety of solid foods, as well as eating with a spoon and drinking from a cup. At six weeks, the child should be able to hold her head erect and steady. By two months, the child should be able to elevate herself using her arms. By three and a half months she should, with help, sit erect.