I would definitely make your own baby food, even if I wasn't low carb. Commercial baby foods are loaded with hidden fillers and are overprocessed. They're certainly not a very good start in life and you might have difficulties getting your child to accept real food when he's older.
I have two children and their first foods were generally mashed avocado, pureed brown rice, sweet potatoes, leafy greens, green beans, carrots, bananas, pears, and apples. I didn't find it to be any extra work - I'd just steam the veggies, blend them to desired consistency, and freeze the puree in ice cube trays. You'll be shocked when you realize how much water is necessary to make a puree. I can't *believe* how much they charge for baby food.
I bought primarily organic foods for my babies and it was still cheaper than buying the processed stuff.
When I started looking at the nutritional content of foods, I realized that rice and other grains don't provide much nutrition to the baby. The fiber is good for them, but most parents feed their children white rice cereal which has negligible fiber. For fiber, I made them porridge with ground whole grains - brown rice, whole oats, etc. Even though I was vehemently against low-carb diets at the time, I didn't want my children to eat foods just to fill up their bellies when they could be eating highly nutritious foods instead, so the grains were a supplement to 1-2 meals a day. The rest of the time, they consumed veggies and fruits (and breastmilk!).
Since they never started on the sweet and processed stuff, neither really developed a taste for it. To this day, they prefer whole grain pancakes (I add soy flour and brown rice protein powder to my flour blend) and baked goods to those made with white flour. I took them to the States to visit my mother and when confronted with white fluffy pancakes, they turned up their noses in disgust! My son kept complaining the they were too sweet to eat.
My son is sensitive to carbs like I am, and it's been easy to change the carb
rotein ratio in his diet since he's always been eating whole grains. My daughter just eats whatever everyone else eats and I've had no complaints.
Good luck!