Delayed gross motor development Delayed ability to stand 2017-02-12T11:48:00Z Child can stand in an upright position on both feet, holding onto a stable object (eg, furniture) for at least 10 s without leaning on it. A failure to achieve the ability to stand up at an appropriate developmental stage. Most children begin to walk alone at 11 to 15 months of age. On average, children can stand while holding on at the age of 9 to 10 months, can pull up to stand and walk with one hand being held at 12 months, and can stand alone and walk well at 18 months.