How soon after a cesarean section can you have a TT or Lipo to abdomen?

Typically I recommend 6 months waiting period.In my own practice it is very common for women to have
abdomonplasty after having had c- sections. In general the abdominoplasty scar
goes at or more commonly below the old c section scar. Care must be
taken when going through the old scar but it is extraordinarily common.

I wish you the best and
strongly suggest you seek the opinion of the board certified plastic surgeon

Best to achieve a long-term stable weight prior to proceeding with surgery. It will also likely be in your best interests to have your child a little older,  and more self-sufficient, prior to proceeding. A few words of advice, i provide my patients may be helpful:
1. Make sure you are doing the procedure for the right reasons (for yourself) and that you have realistic expectations. Be aware that an improvement in the “problem area” may not translate to an overall improvement in your life situation. You are bound to be disappointed with results of the procedure if your motivation for doing the surgery is not internally driven.
2. Time your surgery carefully; generally, it is not a good idea to have surgery done during or immediately after a stressful period in life (for example divorce or death of a loved one). The additional stress of surgery will undoubtedly be more challenging to deal with if a patient's emotional reserves our already exhausted. Remember, that an improvement in your physical appearance will not translate to an improvement in your life situation.
3. If possible speak to patients who have undergone similar procedures and query them about the toughest times of their recovery period. Any practical hints previous patients can provide may be very helpful.
4. Make sure you are aware of potential complications that may arise how to reach your surgeon if necessary.
5. Make sure you have a strong and patient support system (several people if possible) in place who have time/patience to take care of you. Arrange for professional nursing if any doubt exists regarding the availability and/or stamina of your caretakers.
6. Be patient with the healing process, understanding that it will take several weeks to months to feel “normal” again. It may also take many months/year to see the end results of your surgery.
7. Be prepared to distract your mind with things of interest such as books, magazines, and movies.
8. Expect less of yourself; do not go back to work, school or chores too early and let others take care of you (for a change).
9. Pick your surgeon carefully (a well experienced board-certified plastic surgeon) and trust in his/her advice. Keep in close communication with your surgeon and do not hesitate to communicate questions/concerns and the emotional swings that you may experience.
10. Resume all medications that you were using preoperatively when cleared by your plastic surgeon and stop the use of narcotics and sedatives as soon as feasible after surgery.
11. Keep in mind the end results as you go through the tougher emotional times after your surgery.
I hope this, and the attached link, helps.  

Whoa!  Slow down here!  First, you don't know what your abdomen will look like, unless you are a repeat C-sectioner.  Secondly, you need to get down to your pre-pregnancy weight and allow at least six months to elapse before a tummy tuck--assuming that you have childcare in place and aren't continuing to breast feed.  I would encourage you to see a plastic surgeon when the baby is about 3 months old, if your weight is stable by then and discuss the operation.  Best wishes on the baby. Dr K