Frequent morning fussiness and movement in a 3-month-old are often linked to developmental milestones, such as learning to roll over, or discomfort from trapped gas, especially during warmer weather. If your baby rejects a feed during these early morning hours, they likely aren't hungry but are instead working through physical sensations or restlessness. Staying close, providing comfort through touch, or gentle movement in a carrier can help settle them; this phase is usually temporary as they adjust to their changing motor skills and sleep cycles.