We have 3 years and 9 months between our boys and let me tell you, so far not one issue at all.

The ONLY stressful event was in the beginning weeks whenever I was feeding, ChunkyBoy would want attention. We continued to explain to him that we needed quiet time to feed the little guy and made a point of putting aside special 'big boy and mum' time - worked a treat and now they just love each other to death - very cute.

Wouldn't consider another till ChubbyBubby is at least 3.