Throwing up
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Milk allergy would be more projectile vomiting there whole bottles, rash all over body or mucusy bloody stools, raspy breathing, extreme bloating. That looks like regular spit up to me. Constipation is less the frequency of poos and more the consistency if the poos r harder or more solid that's Constipation, but if the consistency is good but just going without a few days is total normal. Make sure ur baby is moving about a lot lots of tummy time as well should help with constipation x
Aptamil also made my baby quite sick, might just not agree with her tummy. Could you switch back? X
Also note that switching formulas can be hard on a babies bellies, doctors recommend that if switching formula use it for at least 2 weeks for their bellies to get use to it. If uve just switched this might by y there a little sick just need to get use to it. It is recommend that u chnsge formula as little as possible as you can mess their tummies up if you keep going bk n forth x
This looks like just a normal amount of spit up.