Maddison & Indah are almost 7 yrs apart (You can work that out in months yourselves LOL!)..
Indah was born exactly 7 days over & @ 8lb1, I dont think she is underweight either!!!
Infact she is in clothes now that Maddy was in at age 2! I think it could be the age of the mother more so than the time between pregs! I also know of friends that are lucky to have 10 months between their babies & all are perfectly normal!

Sometimes life & Mother Nature has her own plans for us & nothing Dr's or scientists tell us can make it change!!!