By now your little cutie has enough control to hold his head and chest up when lying on the stomach. While doing so, he uses his hands to hold the weight of the body. He can even straighten the arms to hold the head and chest even higher. With this improved strength, your baby can now even sit with the hands stretched and body leaned for support.
What you need to know
Your baby many not sit up on his own but will be able to hold the positing with the help of his hands when aided to sit. Make sure that whenever your baby is sitting, there is ample cushioning around as your baby can topple over any time.