Further Reading

Your baby has gradually been developing control of their head, being able to hold it in the centre when lying on their back or tummy and holding it more steady as you hold them. Now, if you pull them gently from lying to sitting they will mostly be able to keep their head straight with only a slight lag of their head as they are pulled upwards.^[1]  

Your baby has been kicking their legs and starting to push against objects that are close to them. By doing this, they are gradually gaining whole body coordination and muscle strength. Now that they have more control of their head, they might like to be held upright sometimes and take some weight on their feet as you hold them.