Diaper Tabs should not overlap or reach and touch each other when the diaper is sized right.
If the diaper tabs overlap then the diaper is likely too big.
The diaper tabs should ideally just reach about 1 inch to 2 inches over the diaper landing zone and there should be at least an inch or so of space between the diaper tabs.
Or if the diaper tabs do not reach at least an inch onto the diaper landing zone on the front of the diaper then it may be too small.
Tight diapers on your baby or toddler should not cause constipation.
However when the diaper is too tight then it can cause the baby or toddler to become uncomfortable cause rashes and red marks around the child's waist.
Tight diapers can also make it hard for the baby or toddler to move around especially if they are walking it can prevent them from sitting down or bending over easily.
So the diaper should not be too tight anyway and if the diaper fits tight then you may need to change diaper sizes and go up a size larger in diapers.
You should be able to fit 2 fingers easily in the diaper waistband between the diaper and the child's waist.
Your baby or toddler may not be getting enough fluids which can lead to constipation.
Most cases of baby constipation or toddler constipation go away on their own within a week or so but if not you should take the baby or toddler the doctor.