Take a trip to the park and play on the baby swings. Only use swings if they have a solid plastic container and straps. At this stage, you might simply place your baby in the swing and sit in front of them. Place your hands under their feet to support them in retaining an upright position, they are likely to slip down the swing seat while they are building the muscles in the core. Only stay in the swing seat for a very short time. If your baby isn’t keen, try again on another day.