Hi and welcome! You are not alone in this - now that you are here! I understand how hard it is to lose weight and to find the motivation for it when you work out alone, but it can be done, one day at a time, one good decision at a time.
When you have a child, your whole world changes, and it is easy to lose yourself and who you were before, getting so caught up in being "mommy", "wife", etc. - it's easy to put yourself last. BUT! In order to be a better mom and wife, friend and a better YOU in general you must make your health and fitness a priority.
Start with food. What you eat and how much will make or break your weight loss goals - I know this from experience!
There are lots of knowledgeable folks here who can help you with a smart, healthy eating plan - but first it would really help if you can list the foods you are eating now, and at what times you eat.
A balance diet of lean proteins, healthy fats, clean natural carbs is best. Stay away from pre-processed packaged boxed foods, frozen dinners, etc. Try to eat fresh fruits, steamed or raw veggies, lean grilled chicken, beef, whole grains.
Depending on your fitness level, try to incorporate some exercise into your day, at least 4 days a week to start.
Working out at home can be done in alot of ways from just walking in your neighborhood, or on a treadmill, to doing bodyweight exercises like modified pushups, jumping jacks, squats, lunges, dips, crunches, planks, etc., also workout videos can be a fun way to get exercise.
What are the chances of your husband working out and eating healthy with you? You could be each other's support and help each other to stay on track.
I found for myself that the best time to work out was in the morning before anyone else was up - no one needed me, no demands being placed on my time - that is one suggestion.
Hope this helps!