Four months checkup

The twins were at kids health center for four months checkup this morning. They are growing fine along the growth curve. Momo-chan's brother is now 6.02kg and Momo-chan's sister is 5.9kg. Both of them are 61cm. His head is 1.2cm bigger than her so they are really about the same size.
Pinga asked the midwife what to do with Momo-chan's brother licking his hand/thumb. Unfortunately she had no good solution for the problem and just said it's less of a problem if he licks whole first. It's more of a problem licking his thumb. Well... he is trying both now and Pinga and her mom are trying to let him used to a pacifier. Let's see how it goes.