Weaning My Almost 10 Month Old

babies can switch over to cows milk at 1 year old.
if your son is 10 months old and you are only going to be working one day a week, I would either pump or try to switch him to cows milk early (ask your pediatriation).
That way you won't have to wean him onto formula, then two months later, wean him onto cow's milk.

I would just pump at work for the next 2 months because he's going to be switched to cows milk at 1 year old anyway. Why do the formula for just 2 months?
Lynsey

At 10 months old my doctor let me use cows milk to help wean my daughter. We put about 2 oz of milk in the bottle with breast milk for 3 days then 1/2 and 1/2, then3 days later all cows milk. She stilled nursed when I wanted her to( mostly at night).When she turned 1 I just stopped nursing and had no problems. My doctor said the formula wasn't important as long as I nursed 1 to 2 times a day.

I wonder if you could still nurse like normal 6 days a week, and not pump that one day? I would ask your lactation consultant/pediatrician/le leche person. Seems to me you wouldn't have to wean for just one day.
Regarding the baby - I wouldn't stress about it. I have a 10-month old who hates formula and won't touch it (I'm home full time), but have learned from having my first 2 sons in daycare that babies adjust. If he doesn't like formula, he'll eat more solids while at daycare, and then when you're home he'll nurse like normal. (at least that's what my boys were like).
Good luck going back. I'm a little jealous :)

Since your baby is already 10 months old and you are only going back to work 1 day/week, it seems a bit challenging to you and to him to transition him to formula for just 2 months and then later transitioning him to cow milk. Since you've already been pumping and your baby has no problem with bottles, is there any way you can work on pumping enough of a supply during the other 6 days/week so that you can perhaps only pump once per day while you are at work? If you don't pump at work but are still nursing full time on the other 6 days, you'll probably feel engorged and uncomfortable by the end of your work day. If you are already thinking about weaning, it might be easier to just put it off until you can transition to cow milk. My daughter has a cow milk allergy, but when I wanted to transition her to goat milk at 15 months, I started out just putting a splash of it in each sippy cup of mostly breastmilk. Then after a week or two, I would increase the amount of goat milk by 1 ounce (and decrease the amount of breastmilk by the same amount). When her cups were 75% goat milk and 25% breastmilk and she was drinking a good amount per day, it was no problem to just make the full switch to goat milk cups. It took us almost 2 months before I could send her to daycare without breastmilk and all goat milk, but I don't think she really noticed the gradual change, even though I still continued to nurse her in the mornings and evenings. By the end I was only pumping once a day and only getting out 2+ ounces, but that was all I needed. I never had issues with engorgement or clogged ducts, etc. BTW, she was fully off bottles and used only sippies and straw cups by around 10 months, so you can think about whether your son is easy going with change or whether you just want to make the transition from bottle to cup at the same time. This is probably not the advice you want to hear (to basically put off weaning for another 2 months), but it seems easier for your son to handle a big change of milk just once... Maybe you can talk to his pediatrician about introducing an ounce or two of cow milk a day at 11 months so that you can begin the process of full weaning a tiny bit earlier??

Here's the best advice I have......(and what I did). About a month before I wanted to fully wean my daughter (from breast to whole milk), I started by cutting out one pumping session a day (I was pumping 2x a day at work). I did this for one week. The second week, I cut out the second pumping session at work. So I was down to nursing 1x in the morning and 1-2 times a night. The third week I cut out the early evening nursing and then in the last two weeks, I cut down on the morning and then lastly the night feeding. I had no soreness, engorgement, etc with weaning. It was PAINLESS for me and a nice transition for my daughter because we slowly got rid of the boob. Instead of a bottle, however, I moved her to a sippie cup at 11 months so she had that when weaned (12 months). I would introduce a sippie cup to him during the day and then maybe offer a bottle in the morning/evening.

Good luck!