Sometimes it's not only about the power of the lighting, but the quality/positioning/other factors of the lighting. While one AB is often enough light for most situations, does not mean it is often the right lighting setup. Clearly the height of the ceiling can become an issue with large softboxes as that, but there are workarounds if your main subject is babies. If you start doing full sized adults, then that can become a limiting situation, if you ever want to get overhead lighting from the softboxes.
How much learning and research did you do before buying the lights? I ask because I bought 2 AB's and softboxes also, but I bought those before even learning how to light properly. Looking back now, and if I take up portrait photography again in the future, I plan on starting with 1 light, and learning as much as I can by using 1 light. Once I feel I have gained knowledge and skill, then I would move onto a 2nd, and then repeat the process.
Either way, grab a good book on lighting. I'm sure you can get some recommendations here (sadly I never went further with my ambition and so I don't know of any). While the environment you have certainly does place some limits on your photography, many photographers work with lots of limiting factors, so don't let that stop you. If the lights are too bright even on lowest power, consider using an ND filter.