Not seeing your baby alternate head position when lying on his/her back. He/she may be susceptible to developing a flat spot in the back of the head due to constant and frequent pressure from the bed. Be wary of not seeing your baby eventually take to tummy time. On average, a 2 month old is able to raise his/her head up in the tummy time position, for a few seconds, and do so at least 3 to 5 times in one sitting. On average, a 4 month old is able to completely raise his/her head and sometimes lift the chest off the bed by pushing up through the forearms. They are able to maintain this position for 5 to 10 minutes before getting tired. If your baby is nowhere near these accomplishments relative to their age, it is appropriate to do a few sessions of physical therapy to learn a home exercise program which will help your baby accomplish all age-appropriate milestones.
Seeing your baby favor looking to one side, or tilting his/her head to one side. You will know they favor a side when they are only comfortable being held a certain way or fed in a certain position. They may have tightness on one side of the neck, which should be addressed as soon as possible to minimize greater challenges.
Not seeing a lot of movement activity and exploration from your baby/ toddler. Not seeing your baby/ toddler use or move their arms or legs the same way on both sides. Not seeing your baby/ toddler try to engage in an appropriate motor activity or demonstrate an age- appropriate motor skill. Your baby/ toddler may show fear, discomfort, or lack of interest in moving their body to explore their environment if they have physical challenges and thus may need specialized guidance with PT.